An emergency alert of an impending missile attack sends Los Angeles into chaos and uncertainty, while the officers each try to keep the peace and deal with their own disasters.

John and Jessica's relationship gets a lot more complicated after she delivers some surprising news; Officer Bradford and Officer West are assigned a community policing project helping out the Watts Rams as volunteer coaches.

Officer Nolan kicks off his birthday by babysitting a crime scene at a law office; Officer Bradford and Officer West are set to receive special awards; Sgt. Grey rides patrol with Officer Harper after she requests an early annual evaluation.

Officer Nolan's trust is tested when he tries to help the previous owner of his home reconnect with his family; Officer Harper's overnight visit with her daughter is put into jeopardy when her past undercover life resurfaces again.

Officer Nolan and the team are charged with escorting a notorious female serial killer to the graves of her victims; Officer Chen meets a seemingly perfect man who sparks her interest; Officer Lopez worries about Wesley.

Officer Nolan and the entire team are in a desperate search to rescue Officer Chen after her abduction; Officer Lopez discovers Wesley unconscious from a dangerous cocktail of alcohol and pills.

The rookies are asked to develop their first confidential informants; Officer Chen's mother complicates her home life when she comes to stay with her.

Homicide investigators are convinced an apparent murder-suicide was staged but the experienced CSI on the scene disagrees; only the instincts of the cops, coupled with an outside forensic expert's opinion, convince authorities who the real killer is.

Police struggle to identify the body of a woman found floating in the Indian River; with only a piece of nautical rope, a strip of duct tape and some plastic bags to go on, they use every forensic tool they have to catch her killer.

From tropical Hawaii to the frigid waters of Lake Ontario, experts reveal the clues nature leaves behind on a human corpse.

A young bystander is shot during a difficult operation; Chief Lugo reviews the shootout and Halstead becomes a key player in the outcome.

A patrol officer becomes a suspect when a van explodes during a Chicago street festival; Burgess, who helped train the officer, is desperate to prove his innocence.

The investigation into a murder of an illegal immigrant is hampered by the perception of police among the city's immigrant population.

The investigation into a drug-related homicide is hampered by the neighborhood's no-snitch culture; Upton is asked about Ruzek's rough altercation with a suspect.

A meth lab bust uncovers a scam in which children adopted from foreign countries are abandoned, then sold online; Atwater struggles with decisions about moving his siblings to a safer environment.

A family is killed, and the team searches for a drug dealer with a likely connection; Voight asks Vice Sgt. Sean McGrady for help.

Halstead goes undercover to stop an ex-military kidnapping crew from killing an innocent child.

A young bystander is shot during a difficult operation; Chief Lugo reviews the shootout and Halstead becomes a key player in the outcome.

A patrol officer becomes a suspect when a van explodes during a Chicago street festival; Burgess, who helped train the officer, is desperate to prove his innocence.

The investigation into a murder of an illegal immigrant is hampered by the perception of police among the city's immigrant population.

The investigation into a drug-related homicide is hampered by the neighborhood's no-snitch culture; Upton is asked about Ruzek's rough altercation with a suspect.

A meth lab bust uncovers a scam in which children adopted from foreign countries are abandoned, then sold online; Atwater struggles with decisions about moving his siblings to a safer environment.

Natalee Holloway travels to Aruba with friends to celebrate the end of high school.

Christine is last seen leaving a nightclub; nine hours later, her body is found abandoned by the side of a road, sparking an investigation into the events of her final hours.

A young bystander is shot during a difficult operation; Chief Lugo reviews the shootout and Halstead becomes a key player in the outcome.

A patrol officer becomes a suspect when a van explodes during a Chicago street festival; Burgess, who helped train the officer, is desperate to prove his innocence.

The investigation into a murder of an illegal immigrant is hampered by the perception of police among the city's immigrant population.

The investigation into a drug-related homicide is hampered by the neighborhood's no-snitch culture; Upton is asked about Ruzek's rough altercation with a suspect.

A meth lab bust uncovers a scam in which children adopted from foreign countries are abandoned, then sold online; Atwater struggles with decisions about moving his siblings to a safer environment.

A family is killed, and the team searches for a drug dealer with a likely connection; Voight asks Vice Sgt. Sean McGrady for help.

Halstead goes undercover to stop an ex-military kidnapping crew from killing an innocent child.

Sophisticated crime fighters map the psychological and physical terrain of multiple murderers.

Criminals are betrayed by the clues their own bodies leave behind.

Using technology to solve crime.

Severide wants further investigation when a homeowner saved from a fire is found clutching a suspicious box; Molly's II needs a chef.

The members of the firehouse spring into action when a helicopter explodes over a densely populated area, scattering debris; a dangerous man corners Brett.

Dawson and Casey's relationship is tested as the team responds to a truck leaking hydrochloric acid in a busy intersection; Severide learns about Brittany's past; Mouch has dating troubles.

A house fire puts a couple in danger; Dawson and Casey are pushed apart; the Chicago Holiday Fest gives Molly's II a chance to shine.

Two members of the firehouse go missing after a routine call; Casey and Dawson struggle to balance their personal and professional lives; Boden and Donna learn their baby has potential complications.

Evidence at a storage unit fire seems to be connected to the blaze that took Shay's life; Chaplain Orlovsky is in a car accident.

More clues emerge about the fire that killed Shay, leading Severide to a former nemesis; Shay's sister visits; Cruz is faced with a surprise; Boden tries to help his father.

Severide wants further investigation when a homeowner saved from a fire is found clutching a suspicious box; Molly's II needs a chef.

The members of the firehouse spring into action when a helicopter explodes over a densely populated area, scattering debris; a dangerous man corners Brett.

Dawson and Casey's relationship is tested as the team responds to a truck leaking hydrochloric acid in a busy intersection; Severide learns about Brittany's past; Mouch has dating troubles.

A house fire puts a couple in danger; Dawson and Casey are pushed apart; the Chicago Holiday Fest gives Molly's II a chance to shine.

Two members of the firehouse go missing after a routine call; Casey and Dawson struggle to balance their personal and professional lives; Boden and Donna learn their baby has potential complications.

Evidence at a storage unit fire seems to be connected to the blaze that took Shay's life; Chaplain Orlovsky is in a car accident.

More clues emerge about the fire that killed Shay, leading Severide to a former nemesis; Shay's sister visits; Cruz is faced with a surprise; Boden tries to help his father.

Severide wants further investigation when a homeowner saved from a fire is found clutching a suspicious box; Molly's II needs a chef.

The members of the firehouse spring into action when a helicopter explodes over a densely populated area, scattering debris; a dangerous man corners Brett.

Dawson and Casey's relationship is tested as the team responds to a truck leaking hydrochloric acid in a busy intersection; Severide learns about Brittany's past; Mouch has dating troubles.

A house fire puts a couple in danger; Dawson and Casey are pushed apart; the Chicago Holiday Fest gives Molly's II a chance to shine.

Two members of the firehouse go missing after a routine call; Casey and Dawson struggle to balance their personal and professional lives; Boden and Donna learn their baby has potential complications.

Sophisticated crime fighters map the psychological and physical terrain of multiple murderers.

Criminals are betrayed by the clues their own bodies leave behind.

Two Altadena, Calif., families fear for their lives when an LAPD cop moves in next door.

Murder weapons often hold several critical forensic clues about the crime.

A high school athlete threatens suicide after being kidnapped and beaten.

Two Altadena, Calif., families fear for their lives when an LAPD cop moves in next door.

Murder weapons often hold several critical forensic clues about the crime.

A high school athlete threatens suicide after being kidnapped and beaten.

Two Altadena, Calif., families fear for their lives when an LAPD cop moves in next door.

A high school athlete threatens suicide after being kidnapped and beaten.

Murder weapons often hold several critical forensic clues about the crime.

The pursuit of a missing teenager leaves Mills and Brett stranded in unforgiving elements; members of the firehouse care for an abandoned newborn; Severide receives an intriguing proposal; Boden is at odds with his father (Richard Roundtree).

A temporary chief fills in for Boden, who is forced to take some time off for personal reasons; Lt. Severide deals with an unwelcome addition to the squad; Brett becomes close to a girl she previously rescued; Casey starts seeing a new woman.

Severide steps in when Chief Pridgen tries to shift blame for a tactical error onto Casey; Mouch learns he fathered a child through a sperm donation; Brett and Cruz take Dawson on a double date.

Severide talks to Chief Boden for an old friend who needs a second chance with the fire department; Mills endeavors to regain his active status; Brett and Dawson decide they need a night out.

Herrmann tries to rescue a toddler from a structure fire; Mills discovers unexpected news; Brett and Cruz's relationship reaches a critical juncture; Otis is surprised by some feelings that develop.

Members of Firehouse 51 transport victims of a gas leak to nearby Chicago Med; an armed patient claiming to be carrying a deadly airborne disease forces Chicago Med into lockdown.

1981, and Birmingham explodes; Dante, in love, wanders into a riot; he finds himself in a new world, surprising, dangerous, but full of opportunity.

Mills works to save the life of a driver injured in a car wreck; Casey harbors doubts about Jack Nesbitt; Hermann, Otis, Cruz and Chaplain Orlovsky ready their team for the peewee hockey championship.

The pursuit of a missing teenager leaves Mills and Brett stranded in unforgiving elements; members of the firehouse care for an abandoned newborn; Severide receives an intriguing proposal; Boden is at odds with his father (Richard Roundtree).

The pursuit of a missing teenager leaves Mills and Brett stranded in unforgiving elements; members of the firehouse care for an abandoned newborn; Severide receives an intriguing proposal; Boden is at odds with his father (Richard Roundtree).

A temporary chief fills in for Boden, who is forced to take some time off for personal reasons; Lt. Severide deals with an unwelcome addition to the squad; Brett becomes close to a girl she previously rescued; Casey starts seeing a new woman.

A temporary chief fills in for Boden, who is forced to take some time off for personal reasons; Lt. Severide deals with an unwelcome addition to the squad; Brett becomes close to a girl she previously rescued; Casey starts seeing a new woman.

Severide steps in when Chief Pridgen tries to shift blame for a tactical error onto Casey; Mouch learns he fathered a child through a sperm donation; Brett and Cruz take Dawson on a double date.

Severide steps in when Chief Pridgen tries to shift blame for a tactical error onto Casey; Mouch learns he fathered a child through a sperm donation; Brett and Cruz take Dawson on a double date.

Severide talks to Chief Boden for an old friend who needs a second chance with the fire department; Mills endeavors to regain his active status; Brett and Dawson decide they need a night out.

1981, and Birmingham explodes; Dante, in love, wanders into a riot; he finds himself in a new world, surprising, dangerous, but full of opportunity.

Herrmann tries to rescue a toddler from a structure fire; Mills discovers unexpected news; Brett and Cruz's relationship reaches a critical juncture; Otis is surprised by some feelings that develop.

Herrmann tries to rescue a toddler from a structure fire; Mills discovers unexpected news; Brett and Cruz's relationship reaches a critical juncture; Otis is surprised by some feelings that develop.

Members of Firehouse 51 transport victims of a gas leak to nearby Chicago Med; an armed patient claiming to be carrying a deadly airborne disease forces Chicago Med into lockdown.

Members of Firehouse 51 transport victims of a gas leak to nearby Chicago Med; an armed patient claiming to be carrying a deadly airborne disease forces Chicago Med into lockdown.

Mills works to save the life of a driver injured in a car wreck; Casey harbors doubts about Jack Nesbitt; Hermann, Otis, Cruz and Chaplain Orlovsky ready their team for the peewee hockey championship.

1981, and Birmingham explodes; Dante, in love, wanders into a riot; he finds himself in a new world, surprising, dangerous, but full of opportunity.

The pursuit of a missing teenager leaves Mills and Brett stranded in unforgiving elements; members of the firehouse care for an abandoned newborn; Severide receives an intriguing proposal; Boden is at odds with his father (Richard Roundtree).

An elite California lakeside community is shaken when two well-to-do gentlemen go to war over a one-inch property line discrepancy; one neighbor takes the dispute to new heights when he hires a hit man to solve the problem permanently.

Fire, water, earth - killers call on all the elements in their attempt to cover up their crimes.

After his escape from a prison transport, the unit pursues a man accused of killing his child.

An elite California lakeside community is shaken when two well-to-do gentlemen go to war over a one-inch property line discrepancy; one neighbor takes the dispute to new heights when he hires a hit man to solve the problem permanently.

Fire, water, earth - killers call on all the elements in their attempt to cover up their crimes.

After his escape from a prison transport, the unit pursues a man accused of killing his child.

An elite California lakeside community is shaken when two well-to-do gentlemen go to war over a one-inch property line discrepancy; one neighbor takes the dispute to new heights when he hires a hit man to solve the problem permanently.

After his escape from a prison transport, the unit pursues a man accused of killing his child.

Fire, water, earth - killers call on all the elements in their attempt to cover up their crimes.

Dr. Connor Rhodes is reunited with his sister as he treats a family friend; Dr. Natalie Manning must persuade a young musician to undergo a life-saving surgery that could destroy her hearing.

The doctors treat those injured in a movie theater shooting; Natalie asks Daniel for help treating a teenager with an eating disorder; a patient surprises everyone.

Rhodes and Zanetti race to save a member of Firehouse 51; April's brother struggles during his first day at the hospital; a woman saved from a burning building leads to a bigger mystery.

Airplane stowaways are brought to the hospital with significant injuries; Cornelius Rhodes (D.W. Moffett) is honored after making a large donation to the hospital; Dr. Manning's mother-in-law (Annie Potts) misunderstands Dr. Halstead's intentions.

A patient's life is in jeopardy when legal issues complicate an essential bone marrow transplant; Dr. Charles comes to an unusual conclusion about a homeless man's recent behavior; Dr. Manning's parents visit; victims of a hit-and-run accident.

After returning from maternity leave, Dr. Manning helps treat a teenager with an extensive history of medical issues; Dr. Choi goes above and beyond when a former Navy shipmate has a potentially life-threatening ailment.

Straight out of Quantico, FBI Agent Nina Hayes gets herself assigned to the Ezra Saxton case in Phoenix; Nina pinpoints a potential target within the organization, Jim Ellis, who has unknowingly entangled himself further in the criminal web.

Dr. Connor Rhodes is reunited with his sister as he treats a family friend; Dr. Natalie Manning must persuade a young musician to undergo a life-saving surgery that could destroy her hearing.

The doctors treat those injured in a movie theater shooting; Natalie asks Daniel for help treating a teenager with an eating disorder; a patient surprises everyone.

Rhodes and Zanetti race to save a member of Firehouse 51; April's brother struggles during his first day at the hospital; a woman saved from a burning building leads to a bigger mystery.

Airplane stowaways are brought to the hospital with significant injuries; Cornelius Rhodes (D.W. Moffett) is honored after making a large donation to the hospital; Dr. Manning's mother-in-law (Annie Potts) misunderstands Dr. Halstead's intentions.

A patient's life is in jeopardy when legal issues complicate an essential bone marrow transplant; Dr. Charles comes to an unusual conclusion about a homeless man's recent behavior; Dr. Manning's parents visit; victims of a hit-and-run accident.

After returning from maternity leave, Dr. Manning helps treat a teenager with an extensive history of medical issues; Dr. Choi goes above and beyond when a former Navy shipmate has a potentially life-threatening ailment.

Straight out of Quantico, FBI Agent Nina Hayes gets herself assigned to the Ezra Saxton case in Phoenix; Nina pinpoints a potential target within the organization, Jim Ellis, who has unknowingly entangled himself further in the criminal web.

Daily gossip and celebrity news from home and abroad; roving reporters and Hollywood correspondents provide must-have details on scoops.

A three-year feud over land and morals reaches a bloody conclusion for a young mother in Miami.

In fall 1991, Toronto was paralyzed by the story of a missing six-year-old girl found raped and murdered in the boiler room of her apartment building; with four suspects, CSIs turned to the brand-new science of DNA to catch the killer.

While investigating gunshots in a fancy neighborhood, the team is confronted by a group of dangerous gun runners.

A three-year feud over land and morals reaches a bloody conclusion for a young mother in Miami.

In fall 1991, Toronto was paralyzed by the story of a missing six-year-old girl found raped and murdered in the boiler room of her apartment building; with four suspects, CSIs turned to the brand-new science of DNA to catch the killer.

While investigating gunshots in a fancy neighborhood, the team is confronted by a group of dangerous gun runners.

A three-year feud over land and morals reaches a bloody conclusion for a young mother in Miami.

While investigating gunshots in a fancy neighborhood, the team is confronted by a group of dangerous gun runners.

In fall 1991, Toronto was paralyzed by the story of a missing six-year-old girl found raped and murdered in the boiler room of her apartment building; with four suspects, CSIs turned to the brand-new science of DNA to catch the killer.

The team races to save a man under siege by his high-tech smart home; a yoga teacher loses her vision; Athena hunts down a bank robber disguised by COVID-19 protocols; members of the 118's crew prepare for an out-of-state mission.

Athena investigates a mysterious murder during a neighborhood block party; the 118 rush to save lives endangered by a bomb threat; Chimney has a hard time keeping secrets when Maddie and Buck's parents come to town.

The 118 races to save the lives of workers trapped in a factory fire; Maddie reveals a painful family secret that causes Buck to confront his childhood and answer why he is the daredevil he is today.

The 118 has a day from hell with a never-ending series of bizarre emergency calls; a man tapes himself to a freeway billboard; a restaurant manager destroys his own business; Eddie feels a spark with Christopher's former teacher.

A man gets pinned under a Humvee; a garage band rocks out too hard; Michael notices strange behavior at a nearby apartment; Hen's mother unexpectedly arrives and announces she is moving to Los Angeles.

The 118 are called to the tarmac when a flight attendant reaches her limit with her flight's passengers; Eddie worries Christopher will not accept him dating; Buck reconnects with an old flame.

Athena and the 118 race to save lives after a drunken driver causes a deadly pileup on the freeway; Maddie goes into labor; Hen and Karen are devastated as they prepare their foster daughter to be reunited with her birth mother.

Athena and the 118 race to save lives after a drunken driver causes a deadly pileup on the freeway; Maddie goes into labor; Hen and Karen are devastated as they prepare their foster daughter to be reunited with her birth mother.

Athena investigates a mysterious murder during a neighborhood block party; the 118 rush to save lives endangered by a bomb threat; Chimney has a hard time keeping secrets when Maddie and Buck's parents come to town.

The 118 races to save the lives of workers trapped in a factory fire; Maddie reveals a painful family secret that causes Buck to confront his childhood and answer why he is the daredevil he is today.

The 118 has a day from hell with a never-ending series of bizarre emergency calls; a man tapes himself to a freeway billboard; a restaurant manager destroys his own business; Eddie feels a spark with Christopher's former teacher.

A man gets pinned under a Humvee; a garage band rocks out too hard; Michael notices strange behavior at a nearby apartment; Hen's mother unexpectedly arrives and announces she is moving to Los Angeles.

The 118 are called to the tarmac when a flight attendant reaches her limit with her flight's passengers; Eddie worries Christopher will not accept him dating; Buck reconnects with an old flame.

Athena and the 118 race to save lives after a drunken driver causes a deadly pileup on the freeway; Maddie goes into labor; Hen and Karen are devastated as they prepare their foster daughter to be reunited with her birth mother.

The team races to save a man under siege by his high-tech smart home; a yoga teacher loses her vision; Athena hunts down a bank robber disguised by COVID-19 protocols; members of the 118's crew prepare for an out-of-state mission.

In Carmel Canyon, Calif., wealthy neighbors get into disputes over everything from shared roads and bridges to the upkeep of their respective properties until anger boils over, and the ongoing feud is resolved with fatal gunfire.

In 1988, motorists discover human body parts dumped along the highway.

The team is called in when a couple holds up a bank in an attempt to get money for their son, who is dying of leukemia.

In Carmel Canyon, Calif., wealthy neighbors get into disputes over everything from shared roads and bridges to the upkeep of their respective properties until anger boils over, and the ongoing feud is resolved with fatal gunfire.

In 1988, motorists discover human body parts dumped along the highway.

The team is called in when a couple holds up a bank in an attempt to get money for their son, who is dying of leukemia.

In Carmel Canyon, Calif., wealthy neighbors get into disputes over everything from shared roads and bridges to the upkeep of their respective properties until anger boils over, and the ongoing feud is resolved with fatal gunfire.

The team is called in when a couple holds up a bank in an attempt to get money for their son, who is dying of leukemia.

In 1988, motorists discover human body parts dumped along the highway.

A 9/11 hero with pulmonary fibrosis needs a new set of lungs; Sarah considers hospitals for her residency match; April and Maggie want to remain at Chicago Med; a teenage hockey player with an overbearing father is injured.

A patient with a life-threatening heart condition makes a decision that puts Rhodes and Choi at odds; the lawsuit against Halstead moves forward; a patient who was misdiagnosed has a flesh-eating bacterial disease; a girl with contagious bacteria.

Nurse Lockwood is arrested for refusing to do a DUI blood test on a patient without his consent; Dr. Halstead discusses his impending lawsuit with his lawyer; Dr. Manning and Sharon Goodwin raise concerns about the nature of a baby's injuries.

A husband has an unusual request after the death of his wife; Dr. Charles tries to deal with a patient who wants to cut off his own arm; Dr. Rhodes is concerned about possible complications for a boy who swallowed magnets.

Dr. Choi is tested when an erratic patient takes drastic measures; Dr. Manning questions the circumstances behind a young boy's broken wrist.

A patient refuses medication for her pain; Dr. Halstead treats a former high school classmate; a pregnant woman has a big reason not to deliver her child.

Lucie Blackman, a 21-year-old British woman, vanishes in Tokyo while working as a hostess during a break from university.

Luka Gordic joins friends for a Spring Break weekend party in British Columbia.

A patient with a life-threatening heart condition makes a decision that puts Rhodes and Choi at odds; the lawsuit against Halstead moves forward; a patient who was misdiagnosed has a flesh-eating bacterial disease; a girl with contagious bacteria.

Nurse Lockwood is arrested for refusing to do a DUI blood test on a patient without his consent; Dr. Halstead discusses his impending lawsuit with his lawyer; Dr. Manning and Sharon Goodwin raise concerns about the nature of a baby's injuries.

A husband has an unusual request after the death of his wife; Dr. Charles tries to deal with a patient who wants to cut off his own arm; Dr. Rhodes is concerned about possible complications for a boy who swallowed magnets.

Dr. Choi is tested when an erratic patient takes drastic measures; Dr. Manning questions the circumstances behind a young boy's broken wrist.

A patient refuses medication for her pain; Dr. Halstead treats a former high school classmate; a pregnant woman has a big reason not to deliver her child.

Lucie Blackman, a 21-year-old British woman, vanishes in Tokyo while working as a hostess during a break from university.

Luka Gordic joins friends for a Spring Break weekend party in British Columbia.

Enmity, treachery and gunfire ensue when a man rejects the romantic advances of his next door neighbor.

In 1990, Gainesville, Fla., becomes the site of a number of coed murders.

When a girl calls 911, the dispatcher does not believe that an intruder has entered her house until gunshots are heard; upon arriving, the SRU discovers that the girl has been abducted.

Enmity, treachery and gunfire ensue when a man rejects the romantic advances of his next door neighbor.

In 1990, Gainesville, Fla., becomes the site of a number of coed murders.

When a girl calls 911, the dispatcher does not believe that an intruder has entered her house until gunshots are heard; upon arriving, the SRU discovers that the girl has been abducted.

Enmity, treachery and gunfire ensue when a man rejects the romantic advances of his next door neighbor.

When a girl calls 911, the dispatcher does not believe that an intruder has entered her house until gunshots are heard; upon arriving, the SRU discovers that the girl has been abducted.

In 1990, Gainesville, Fla., becomes the site of a number of coed murders.

Nolan takes his son's fiancée, Abigail, on a ride-along after she shows interest in becoming a police officer; Jackson's relationship becomes increasingly complicated.

Nolan is given some life-changing news and invites Grace over for a home-cooked meal in his newly remodeled kitchen; each unit is tasked with following up on dormant cases in hopes of uncovering new leads.

Officers Nolan and Harper investigate a murder which may have national security implications; Officer Bradford must confront his past when he crosses paths with a homeless veteran.

Officer Nolan learns his identity has been stolen and could jeopardize his position as an officer; Sgt. Grey must testify at the parole hearing of the man who shot him and murdered his partner.

Officers Chen and Bradford respond to a call at the Los Angeles auditions of "American Idol" and Officer Chen ends up facing Ryan Seacrest and the judges; Chen befriends a reporter whose motives are not clear.

Officer Nolan's relationship with his first confidential informant is tested when he discovers her back on the street dealing drugs; Lucy's fear of dating following her abduction is beginning to threaten her friendship with Jackson.

Officers Nolan and Harper escort four juvenile offenders to a Scared Straight program at a correctional facility, but it quickly becomes a riotous situation; Nolan is uncertain about Grace after she fails to introduce him to her ex-husband.

Nolan takes his son's fiancée, Abigail, on a ride-along after she shows interest in becoming a police officer; Jackson's relationship becomes increasingly complicated.

Nolan is given some life-changing news and invites Grace over for a home-cooked meal in his newly remodeled kitchen; each unit is tasked with following up on dormant cases in hopes of uncovering new leads.

Officers Nolan and Harper investigate a murder which may have national security implications; Officer Bradford must confront his past when he crosses paths with a homeless veteran.

Officer Nolan learns his identity has been stolen and could jeopardize his position as an officer; Sgt. Grey must testify at the parole hearing of the man who shot him and murdered his partner.

Officers Chen and Bradford respond to a call at the Los Angeles auditions of "American Idol" and Officer Chen ends up facing Ryan Seacrest and the judges; Chen befriends a reporter whose motives are not clear.

Officer Nolan's relationship with his first confidential informant is tested when he discovers her back on the street dealing drugs; Lucy's fear of dating following her abduction is beginning to threaten her friendship with Jackson.

Officers Nolan and Harper escort four juvenile offenders to a Scared Straight program at a correctional facility, but it quickly becomes a riotous situation; Nolan is uncertain about Grace after she fails to introduce him to her ex-husband.

Nolan takes his son's fiancée, Abigail, on a ride-along after she shows interest in becoming a police officer; Jackson's relationship becomes increasingly complicated.

The disappearance of millionaire Frank Black.

CSIs determine that a girl's ex-husband had his parents assassinate her.

Explosive experts sifting through bomb evidence discover a more insidious plan.

A family is killed, and the team searches for a drug dealer with a likely connection; Voight asks Vice Sgt. Sean McGrady for help.

Halstead goes undercover to stop an ex-military kidnapping crew from killing an innocent child.

When one of Voight's friends is found passed out in his hotel room with a dead Ukrainian girl, Intelligence discovers the murder is connected to a sting and Burgess' boyfriend.

The death of Judge Tommy Wells' daughter puts Intelligence on the track of a pill mill spreading into the suburbs of Chicago and the doctor enabling it; Voight discovers who's been leaking information from the 21st.

Halstead puts his career on the line to help solve a case with ties to his new girlfriend; Voight finally discovers the mole in his unit.

Burgess works with her first criminal informant to track down a ruthless pimp and break up his prostitution ring.

When Atwater disappears at the house of a convicted felon, the intelligence unit rallies to rescue him before it's too late.

A family is killed, and the team searches for a drug dealer with a likely connection; Voight asks Vice Sgt. Sean McGrady for help.

Halstead goes undercover to stop an ex-military kidnapping crew from killing an innocent child.

When one of Voight's friends is found passed out in his hotel room with a dead Ukrainian girl, Intelligence discovers the murder is connected to a sting and Burgess' boyfriend.

The death of Judge Tommy Wells' daughter puts Intelligence on the track of a pill mill spreading into the suburbs of Chicago and the doctor enabling it; Voight discovers who's been leaking information from the 21st.

Halstead puts his career on the line to help solve a case with ties to his new girlfriend; Voight finally discovers the mole in his unit.

Lucie Blackman, a 21-year-old British woman, vanishes in Tokyo while working as a hostess during a break from university.

Luka Gordic joins friends for a Spring Break weekend party in British Columbia.

A family is killed, and the team searches for a drug dealer with a likely connection; Voight asks Vice Sgt. Sean McGrady for help.

Halstead goes undercover to stop an ex-military kidnapping crew from killing an innocent child.

When one of Voight's friends is found passed out in his hotel room with a dead Ukrainian girl, Intelligence discovers the murder is connected to a sting and Burgess' boyfriend.

The death of Judge Tommy Wells' daughter puts Intelligence on the track of a pill mill spreading into the suburbs of Chicago and the doctor enabling it; Voight discovers who's been leaking information from the 21st.

Halstead puts his career on the line to help solve a case with ties to his new girlfriend; Voight finally discovers the mole in his unit.

Burgess works with her first criminal informant to track down a ruthless pimp and break up his prostitution ring.

When Atwater disappears at the house of a convicted felon, the intelligence unit rallies to rescue him before it's too late.

A private school owner is kidnapped.

An abandoned suitcase containing a young woman's body, leads to a mystery of a second woman missing too.

The murder of a gay couple in rural California leads investigators into the world of hate crimes.

An apartment fire with connections to a rape and attempted murder leads to a joint investigation with the CPD and Sgt. Benson of the NYPD's Special Victims Unit; Dawson risks her life during a call.

Sgt. Voight encourages Lt. Casey to go undercover in order to obtain proof of Jack Nesbitt's shady dealings; tensions grow between Otis and Severide; Herrmann helps another member of the firehouse.

Lt. Casey ends up in danger as he continues to investigate Jack Nesbitt; Boden tries to create unity in the house; Cruz and Boden put their lives on the line to save their own when a warehouse blaze gets out of control; Dawson receives news.

During an undercover operation, Lt. Casey lands in very dangerous territory; Dawson's suspicions are confirmed; a new candidate (Steven R. McQueen) makes an unusual first impression; a protest hinders firefighters who are trying to battle a blaze.

Members of the firehouse are frustrated with their inability to help Chief Boden, whose job is on the line pending an internal investigation in the aftermath of a complicated call to a fire; Lt. Severide struggles to accept his smaller role and adjusts to the presence of Capt. Patterson, his new commanding officer; Dawson shakes things up on the work front and Casey attempts to find a crucial piece of evidence in his ongoing investigation against Nesbitt.

When new evidence appears in the internal affairs investigation that will clear Chief Boden, a twist puts him right back in the thick of it; Brett and Chili try to save a stabbing victim from bleeding to death.

Members of the firehouse band together to help one of their own; Herrmann looks for a way to reopen Molly's; Severide struggles to deal with one of his toughest days as he looks into the arson investigation.

An apartment fire with connections to a rape and attempted murder leads to a joint investigation with the CPD and Sgt. Benson of the NYPD's Special Victims Unit; Dawson risks her life during a call.

Sgt. Voight encourages Lt. Casey to go undercover in order to obtain proof of Jack Nesbitt's shady dealings; tensions grow between Otis and Severide; Herrmann helps another member of the firehouse.

Lt. Casey ends up in danger as he continues to investigate Jack Nesbitt; Boden tries to create unity in the house; Cruz and Boden put their lives on the line to save their own when a warehouse blaze gets out of control; Dawson receives news.

During an undercover operation, Lt. Casey lands in very dangerous territory; Dawson's suspicions are confirmed; a new candidate (Steven R. McQueen) makes an unusual first impression; a protest hinders firefighters who are trying to battle a blaze.

Members of the firehouse are frustrated with their inability to help Chief Boden, whose job is on the line pending an internal investigation in the aftermath of a complicated call to a fire; Lt. Severide struggles to accept his smaller role and adjusts to the presence of Capt. Patterson, his new commanding officer; Dawson shakes things up on the work front and Casey attempts to find a crucial piece of evidence in his ongoing investigation against Nesbitt.

When new evidence appears in the internal affairs investigation that will clear Chief Boden, a twist puts him right back in the thick of it; Brett and Chili try to save a stabbing victim from bleeding to death.

Members of the firehouse band together to help one of their own; Herrmann looks for a way to reopen Molly's; Severide struggles to deal with one of his toughest days as he looks into the arson investigation.

An apartment fire with connections to a rape and attempted murder leads to a joint investigation with the CPD and Sgt. Benson of the NYPD's Special Victims Unit; Dawson risks her life during a call.

Sgt. Voight encourages Lt. Casey to go undercover in order to obtain proof of Jack Nesbitt's shady dealings; tensions grow between Otis and Severide; Herrmann helps another member of the firehouse.

Lt. Casey ends up in danger as he continues to investigate Jack Nesbitt; Boden tries to create unity in the house; Cruz and Boden put their lives on the line to save their own when a warehouse blaze gets out of control; Dawson receives news.

During an undercover operation, Lt. Casey lands in very dangerous territory; Dawson's suspicions are confirmed; a new candidate (Steven R. McQueen) makes an unusual first impression; a protest hinders firefighters who are trying to battle a blaze.

Members of the firehouse are frustrated with their inability to help Chief Boden, whose job is on the line pending an internal investigation in the aftermath of a complicated call to a fire; Lt. Severide struggles to accept his smaller role and adjusts to the presence of Capt. Patterson, his new commanding officer; Dawson shakes things up on the work front and Casey attempts to find a crucial piece of evidence in his ongoing investigation against Nesbitt.

A private school owner is kidnapped.

An abandoned suitcase containing a young woman's body, leads to a mystery of a second woman missing too.

When a man moves to Canyon Country, Calif., he finds himself embroiled in a bizarre and increasingly acrimonious 8-year feud with a neighbor that terminates with blasts from a shotgun.

Investigators are drawn into the dark world of high-end prostitution, illegal aliens and Russian organized crime.

The team's actions, particularly Sgt. Parker's, are called into question after a shooting at a museum gala.

When a man moves to Canyon Country, Calif., he finds himself embroiled in a bizarre and increasingly acrimonious 8-year feud with a neighbor that terminates with blasts from a shotgun.

Investigators are drawn into the dark world of high-end prostitution, illegal aliens and Russian organized crime.

The team's actions, particularly Sgt. Parker's, are called into question after a shooting at a museum gala.

When a man moves to Canyon Country, Calif., he finds himself embroiled in a bizarre and increasingly acrimonious 8-year feud with a neighbor that terminates with blasts from a shotgun.

The team's actions, particularly Sgt. Parker's, are called into question after a shooting at a museum gala.

Investigators are drawn into the dark world of high-end prostitution, illegal aliens and Russian organized crime.

Boden steps up to host a neighborhood wedding that was ruined by a fire; Chief Riddle's political aspirations cause friction at the firehouse; Severide fights his way back to his old position.

Chief Boden's new neighbor asks him for a favor; tension escalates between Severide and Captain Patterson; Cruz receives a surprise visitor; Mouch and Herrmann are excited to receive concert tickets to see Rush.

Boden thinks he's being set up by his neighbor; Severide's father pays him an unexpected visit; romance is in the air at the Chicago Fire Department gala.

Patterson questions Boden's ability to lead the firehouse as the trial approaches; Brett and Chili find an unconscious man in a garden; Otis tries to fill his social calendar.

Members of Firehouse 51 are unhappy when Patterson fills in for Boden while he tries to clear his name; Severide may have found Serena; Chili and Jimmy attract more attention than they expected.