The murder of a reality star throws the CSI team into the scandalous world of a television dating show.

A seemingly normal family is targeted in a brutal grenade attack, leaving Horatio and the team to figure out why.

The team investigates when a man is boiled alive; Julia spins out of control; a dark secret is revealed.

Fifteen years after Kathy Odom's murder, new DNA techniques might help detectives to catch her killer.

Investigators find the body of a missing 43-year-old woman who has been gone for 53 days; finding out who murdered her.

Detectives describe catching up to the serial killer of Baton Rouge.

Earl Bramblett's obsession with his friend's 11-year-old daughter spurred him to murder an entire family.

While Mac and Jack are tracking a dangerous fugitive, a family of bounty hunters kidnap him; Bozer and Riley try to hack into Jack's CIA file.

When Mac and the team are blamed for a terrorist bombing, the Phoenix Foundation is forced to disavow them; the team must clear their names without support from back home.

After an earthquake in Hawaii, Mac and the team join Chin and Kono from the Five-0 task force to rescue a group of government scientists trapped in a building; another group tries to steal top-secret weaponry from the scientists.

Mac's close friend from M.I.T. fakes her own death to prevent someone from killing her to suppress her scientific research.

The BAU team investigates an unsub with striking similarities to Rossi's latest obsession, \.

The team searches for Everett Lynch and his daughter; Spencer has a meaningful visit with his mother.

The BAU team investigates a series of seemingly random fatal explosions throughout Kentucky and Tennessee.

The members of the BAU enjoy a Saturday off in vastly different ways; Rossi and Prentiss help Simmons assemble a new crib; Garcia leads a hacking competition; Dr. Reid strikes up a conversation with a woman named Maxine.

Following a series of fatal shootings, the BAU team travels to Illinois to investigate what appears to be a copycat serial killer.

After a father and daughter get kidnapped, a former foe of the BAU returns with very specific demands for Dr. Reid.

When the BAU team travels to Denver to investigate several murders, Prentiss is forced to evaluate her relationship with Special Agent Andrew Mendoza.

Prentiss and J.J. are faced with important decisions to make about their futures as the BAU travels to Texas to investigate a series of murdered businessmen.

Rossi develops some new theories about Everett Lynch, aka The Chameleon; the team sets out on an epic hunt to capture Lynch.

While hallucinating after he gets a brain injury, Dr. Reid is visited by ghosts from his past; the BAU makes a shocking discovery about Lynch that affects Rossi personally; the team comes together to celebrate Rossi's retirement.

The team closes in on a serial killer (Tim Curry) holding Detective Spicer's daughter hostage.

JJ tries to reunite parents with their missing daughter; the team braces for the loss of one of its own.

When several women are murdered, Rossi revisits a 25-year-old case that causes him to suspect a killer is at work again.

The team searches for a serial killer who is preying on married couples; Hotchner looks to a team member to fill JJ's vacant role.

The team pursues a serial killer targeting families in the Midwest; Morgan receives a visit from Ellie after she runs away from her foster family.

The team searches for a killer who has struck the past three years during Detroit's raucous pre-Halloween celebrations.

Chance, Cie and Snow (Lucky Vanous, Lisa Thornhill, Bobby Hosea) go after a mobster involved in murder and diamond smuggling.

While transporting Jacob Calder to a safer prison, Cie is kidnapped and Chance and Calder must rescue her.

The sister of a murdered federal agent helps track down his killer.

Chance, after interrogation by Hardesty and Snow, is charged with murder when the man he has beaten dies; Cie disappears.

Team Scorpion must stop a catastrophe on Christmas Eve when heavy rain creates a large crack in a dam, putting an entire town in danger.

The members of Team Scorpion brave subzero temperatures in Antarctica to save a United States Special Forces unit; Toby risks his life to save Happy.

Sylvester's father, a retired general, asks the team for help when he thinks a dictator in Africa has uncovered weapons of mass destruction from World War II.

The members of Team Scorpion are asked to help NASA with a top-secret rocket launch, but they must sabotage their own mission when Walter's date finds a bomb strapped to her chest.

When a powerful earthquake hits Los Angeles, Team Scorpion must prevent a pinched gas line from causing a massive explosion.

Team Scorpion must stop an influx of drugs that are being smuggled into the country via drones; an ultimatum is issued.

Sylvester wins big on \.

The team investigates after the Los Angeles blood supply is hacked and tainted, which leaves a young girl who is in need of a heart transplant in peril.

After an explosion in a hotel garage, the Jeffersonian team tries to identify victims by investigating remains found at the scene; Sweets works with a temporary partner (Danielle Panabaker) while Booth works on the department's budget.

While investigating the death of an animal expo employee, the team is drawn into the world of animal trafficking; Brennan thinks she would be a good presidential candidate; Sweets and Daisy make a change.

The team investigates the death of a woman whose body was found in the trash; Booth invites Sweets to stay with him and Brennan until he finds a new place.

While examining bodies deemed unidentifiable, interns uncover the identity of a man who died in the 9/11 terrorist attacks.

A pod containing the remains of a crime-scene cleaner washes onto a beach; Angela and Hodgins learn a secret about Cam.

When a street artist falls into his own adhesive, he also lands on human remains that stay glued to his body; Booth searches a comedy club for suspects.

When a psychic tries to help the spirit of a boy whose death the team is investigating, members of the team start to question their own feelings on life and death.

When the team investigates the death of a dancer who was about to audition for a dance competition show, Booth and Brennan go under cover as contestants.

The team investigates the death of an archaeologist who had just made an important discovery.

When Angela and Hodgins wake to find a corpse in their bedroom, they believe Pelant is behind it; against Booth's wishes, Angela and Hodgins start their own investigation.

The team investigates when two bodies are found at the same burial plot; Brennan and Booth discuss after-death arrangements; Daisy returns for the first time since the breakup.

When a female roller derby skater is killed and dismembered, Angie goes under cover to help solve the case; Cam tries to learn more about Booth's secretive hospital appointments.

A routine trip to the hospital leads a wealthy businessman to lose his baby daughter after his SUV is hijacked.

A break in a six-month cyber crime investigation leads Michelle and Dev to pursue a reckless hacker.

Toby and Oz are taken hostage by two men posing as security guards when they are dispatched to a routine call in the financial district.

A celebrated restaurant chef is a star witness in the trial of a mob boss charged with shooting his business partner.

A controlled fire in the Everglades reveals the body of a slain hunter, then a wall of fire overtakes Alexx and Delko at the crime scene, forcing them to take refuge under a tarpaulin.

Horatio infers that a slain photographer accidentally witnessed a murder while snapping pictures of a famous actor.

A former surf champion is murdered in his home, while his wife and son are left beaten and bound.

Robbers steal $2.3 million from an armored truck in downtown Miami, but the loot turns out to be counterfeit, and the team must figure out what happened to the bank's money before it was replaced with fake bills.

The detectives' case hinges on the testimony of a forensic-evidence collector who stole a latex glove from the crime scene; co-workers become prime suspects in a waitress's death.

A newspaper reporter witnesses the murder of his friend in Miami's drug district, but Horatio mistrusts the slick young man's version of what happened.

When evidence suggests a slain police officer was crooked, Horatio must find the killer in order to clear the victim's name.

The team investigates the wealthy residents of an airpark after a prop plane crashes into a Miami beach.

When corpses are discovered in public places in Boston, a ride-sharing service may lead the team to the killer.

The BAU looks for a suspect and a motive when victims are found in truck stop restrooms in the South.

An 18-year-old woman escapes from the home where she and two other women were held captive for years.

The BAU team combs Los Angeles for a suspect after security footage is discovered, which shows an unknown subject being invited into victims' homes.

When Morgan is abducted, the members of the BAU team race against time to find him and save his life.

The team searches for an unknown subject who takes children while their parents are asleep; Morgan tries to find out who attacked him.

When an unsub targets the BAU, the team pursues the person who is responsible for the actions.

Emily looks to the BAU for help when tracking an international serial killer; the BAU deals with Morgan's departure.

The BAU hunts for an UnSUB who deliberately disfigures victims; Rossi and his ex-wife have an uncomfortable reunion.

The BAU plays a dangerous cat and mouse game with a convicted serial killer who may have information on the whereabouts of two kidnapped boys.

Hotch is arrested by a SWAT team and suspected of conspiracy; when the team members scramble to prove Hotch's innocence, they discover a larger plot may be on the horizon.

New recruit Luke Alvez helps the team capture a killer who escaped from prison with 12 other convicts.

The team investigates the murder of a Navy contractor who secretly lived two lives for decades.

Pride is given a series of tasks to complete by unknown assailants who are holding Wade and his father hostage.

Pride and the team hope to take down a secret and lethal group of former intelligence agents and avenge the death of someone close to them.

While under cover, Gregorio joins a social club for military wives after one of the members is contacted by an ex-boyfriend who is on the FBI's most wanted list.

NCIS investigates the disappearance of a Navy entomologist after a deadly shooting at a research lab; the team finds that a rare and deadly virus was stolen.

Pride and the team reunite with conspiracy journalist Oliver Crane after the source for his latest story is murdered; Hannah's former partner, Liam Somers, surprises her and shares a shocking revelation about an old case.

The team investigates multiple murders tied to a construction company that creates an experimental chemical that strengthens sea walls; evidence from Hannah's previous mission in Oman is used against her.

After an elusive terrorist with a personal vendetta against Hannah resurfaces, she and her family are placed in protective custody while the team searches for the suspect.

Sniper Jacob Broadsky takes out a victim who escaped from the justice system; Booth uses his military training to try to stop Broadsky before he strikes again; Angela's father visits the Jeffersonian.

During a blizzard that causes a citywide blackout, the team must solve a murder case that could be connected to a possible viral outbreak; Sweets starts a touchy conversation about Brennan and Booth's relationship.

Brennan teams up with a forensic podiatrist to match seven pairs of severed feet with bodies; Cam makes college plans for her daughter.

A TV-show host's remains are found in the wilderness; Vincent Nigel-Murray makes surprising confessions while making amends with each member of the team.

When the remains of a maritime museum security guard are found in the Florida Everglades, Booth asks a former Iraqi soldier for help with the case.

The remains of a successful ad man are found in a new community center playground; the members of the team try to communicate more honestly.

An unidentified 15-year-old girl, who is hearing impaired and not able to communicate, is found covered in blood and wielding a knife; Angela hides the details of her pregnancy.

Booth becomes more determined to catch Jacob Broadsky after he takes out another victim.

Booth and Brennan go under cover to find out what happened to a man whose remains were found lodged in the pinsetter at a bowling lane.

A woman's remains are found in a paintball field; Booth and Brennan adjust to life as an expectant couple.

The team identifies the remains of a competitive-eating champion just days before a contest; a brilliant new squint has trouble fitting in; Booth and Brennan try to put themselves in each other's places after a disagreement about the baby.

Booth and Sweets are given access to a toy company's headquarters after an executive's remains are found packaged with a Prince Charming doll; Sweets prepares for his gun certification test; Brennan worries about motherhood.

After dismembered remains are found in multiple mailing boxes, the team uncovers a complicated love triangle; Booth's grandfather reveals surprising news; Special Agent Genny Shaw (Tina Majorino) learns how important teamwork is.

The team suspects murder when a storm chaser is killed while filming a tornado; Booth becomes increasingly protective of Brennan.

After a cryptic message written in human blood is found at a national monument, the team ends up embarking on a scavenger hunt; Brennan and Booth search for their perfect family home.

When the remains of an escaped convict are found in the sewer, the investigation reveals the man died in prison; Brennan gives birth in unconventional circumstances.

When the team intercepts a terror group's message for Murdoc, instructing him to kill a tech analyst, Mac poses as a psychopath to save the intended victim.

Murdoc moves ahead with his plans for revenge against MacGyver by recruiting his recently released former cellmate to infiltrate the Phoenix Complex and kill every agent inside.

MacGyver uses a cell phone and soccer ball in the search for a Navy SEAL who is believed to be held captive in the Middle East.

Riley disappears during her first solo mission; Mac and the team attempt to locate her.

MacGyver and the team must steal diamonds before terrorists beat them to it and trade the jewels for a weapon of mass destruction.

When Murdoc drugs and kidnaps MacGyver, Mac must escape and join the team to save Murdoc's next victim.

The team's Halloween plans are interrupted when the vice president's son's plane goes down with a mysterious prisoner on board.

Mac and the team attempt to extinguish a massive oil wellhead fire set by a rebel group in Nigeria.

MacGyver uses a heater and hot sauce to help a key presidential candidate in Ecuador receive a heart transplant he desperately needs after a rebel group tries to sabotage delivery of the organ.

MacGyver and Jack \.

When the Miami Taunter strikes again, Horatio meets with the matriarch of the suspected killer's family.

Calliegh uncovers a personal connection to a case involving the near-death of a popular tennis coach.

Horatio uncovers a scandal that pits him against a former adversary; Calleigh faces a life-altering decision.

When an enemy of the CSIs is killed, Horatio looks to his team for a suspect.

The team searches for evidence and survivors after a jet crashes into the Everglades, trying to recreate what transpired on the fatal flight.

Horatio sets out on a personal mission to find his mentor's killer, and Megan worries that he has become too emotionally involved in the case.

Horatio and Megan examine the remains of a human torso found in a tiger shark's stomach. Wanda De Jesus guest stars.

A wealthy family uses their power and influence to distance themselves from a rape and murder investigation.

A priest is shot to death in his church rectory; Horatio and Delko examine the charred remain of a pregnant woman.

Horatio and the team investigate the murder of a 5-year-old girl in a restaurant washroom.

Poisoning is suspected as the team probes the murder of a male stripper found dead in the wake of a female sex party; a deep sea diver is fatally stabbed while underwater.

Evidence on a lost, blood-soaked toddler leads the CSI team to her home where each family member's spilled blood tells a tale of horror. Wanda De Jesus guest stars.

The team tries to get inside the mind of a sniper after three people are shot and killed in downtown Miami.

The team investigates the death of a professor, who was found hanging from a tree after being tortured.

A sex tape featuring the Minister of Foreign Affairs goes viral.

Toby connects with a gifted young woman whose mental powers appear to rival or even surpass his own.

Toby is forced to use his telepathic abilities to keep himself and others alive when he becomes a hostage in a bank heist.

Toby struggles with Alvin Klein during his first official investigation: a 10-year-old murder.

A performer's life is threatened, so Toby poses as her assistant and helps to investigate.

An African teenager, whose father is an alleged war criminal, is abducted.

Toby's telepathy acts as surveillance when Michelle goes under cover to expose an art-theft ring.

Toby and Michelle investigate the connection between a cult and three missing young women.

After thousands of classified government files are stolen, the NCIS team searches for an underground group of hackers who were co-founded by Elvis Bertrand, Pride's old contact.

NCIS agents McGee and Torres head to New Orleans to partner with Pride and his team in the search for the missing homeland security theoretical terror playbook.

Painful memories come flooding back when a gruesome copycat murder leads to the reopening of a case for Wade.

Pride's longtime friend, state and military attorney Rita Devereaux, asks NCIS to investigate the disappearance of a JAG lawyer who specializes in classified cases and volunteers at a private military academy.

A highly skilled special operations Marine assaults six men in a bar, sending the NCIS team on a city-wide manhunt.

Tammy is reunited with her ex-husband, Ethan McKinley - who embezzled millions in Katrina relief funds - after he's tied to the murder of a crime boss' son.

A deadly accident at a naval base exposes a unit of Seabees to a super virus and leaves the rest of the base and the city of New Orleans at risk for an outbreak; Wade is infected with the virus and given hours to live.

Lasalle must investigate his former partner in the Vice unit after the NCIS team finds a link between an international drug ring and the New Orleans Police Department; Rita looks into a connection between the mayor and illegal activity in Clearwater.

Pride listens in on a wiretap of Mayor Hamilton; the NCIS team investigates when Navy weapons get stolen in a train heist; featuring musical performances by Sheryl Crow.

The murder of a Navy chaplain leads Pride to uncover a possible connection between Mayor Hamilton and illegal activity taking place in the city of Clearwater; Percy continues to face repercussions of her choices on a previous case.

When Pride is spotted tracking one of Mayor Hamilton's accomplices on a crowded street, the suspect opens fire, putting innocent lives at risk before disappearing.

Unable to trust anyone in New Orleans, the NCIS team calls in FBI Assistant Director Isler to help expose and stop Mayor Hamilton's sinister scheme.

While Pride remains on probation after his rogue takedown of the corrupt Mayor Hamilton, his team is closely monitored by a strict supervisor; the team must secretly investigate after the FBI takes the lead on a case involving stolen nuclear waste.

An erratic whistleblower who calls Pride her mentor kidnaps him to help her locate a serial killer targeting young women in the Gulf of Mexico.

The team joins forces with FBI Director Isler after a Russian operative with intelligence on sleeper agents disappears; Tammy partners with former sleeper agent Eva Azarova to assist in the disappearance.

The team investigates the copycat murder of an unsolved case from 150 years ago that spawned a legendary ghost story; Gregorio is spooked when the case is connected to a recent séance and a local medium.

In Wilkes-Barre, Pennsylvania, Police respond to a report of a vicious home invasion; in Olathe, Kansas, a brutal murder sends shockwaves through Bible country.

At Lake Mohave, Nevada, a fisherman stumbles across a human skull; in the North West of England, a husband claims his wife has left him for another man, but no one can find her.

In Lexington, Kentucky, a newly wed wife parties like there's no tomorrow, until a body is dumped on a golf course; in Brisbane, Australia, there are fears for the safety of a missing wife.

In Poughkeepsie, New York, a police officer discovers his wife is cheating on him, leading to a deadly encounter; in Orlando, Florida, a woman gets herself a boy toy with fatal results.

In Pleasant Grove, Utah, a former beauty queen goes under the knife to look sexier for her husband, but the romance quickly comes to a horrifying end.

In Alpena, Michigan, a neighborhood recluse winds up dead after developing a special bond with a much younger cleaner who enjoys spending his money.

In Livermore, California, a love triangle sets two women on a collision course; a couple rekindles romance by visiting to a picturesque region of Michigan, but only one of them is coming home.

In Maryland, a real body turns up after a murder mystery dinner; in Adelaide, South Australia, a love rival winds up dead.

Barnaby is called to solve the mystery of an ex-colleague who was brutally murdered.

Barnaby investigates the death of an elderly woman who witnessed a shocking event.

Chief Inspector Barnaby (John Nettles) is called in to investigate when an accomplished author is suspected in the brutal murder of a local writers club's secretary. With Daniel Casey, Jane Wymark and Laura Howard.

A real razor is substituted for a fake one in a drama group's production of \.

Horatio tries to save Yelina; despite Calleigh's protests, Delko gets involved with his dangerous father.

As Eric Delko's life hangs in the balance, Horatio finds himself reminiscing about the formation of the CSI team and how its members first met.

Horatio must submit to a gunman's bizarre request in order to save hostages when the lab is attacked.

Team members investigate when a trio of volleyball players suddenly drops dead on the court; Calleigh's testimony against Delko threatens his future with the CSI unit.

When Miami's most-hated man is murdered, members of the CSI team search for the killer and hidden treasure.

Alexx Woods and Delko try to help the team stop a deadly outbreak in Miami.

The CSIs re-create a night of bachelor party debauchery to solve a murder and find a missing groom.

Dr. Ray Langston (Laurence Fishburne), from the Las Vegas office, comes to Miami when a severed leg found in the Everglades is linked to a girl who went missing in Las Vegas a week earlier.

When the CSIs investigate what caused a car accident, both drivers' darkest secrets are revealed.

Deadly jellyfish are used as a murder weapon; a mysterious woman from Jesse's past returns.

The case of a dead census worker sends the team into a high-speed chase and an explosion that threatens investigators' lives.

Eric Delko returns as an expert witness for the defense, pitting himself against his old team.

A Nashville detective describes how he finally caught up with suspected serial killer Bruce Mendenhall.

The story behind the murderous rampage of convicted Israeli killer Elias Abuelazam.

The head of the murder for hire company, Richard Savage, hired Sean Doutre to carry out two brutal hits.

A look at the FBI efforts to convict attorney Thomas Capano with the murder of his mistress Anne Marie Fahey.

Mac and the team follow mercenaries who are transporting stolen lethal nerve gas; Jack confronts Elwood about Riley; Bozer is pushed to his limit in spy school.

Mac must help college students stranded on a research ship in the Arctic Ocean; Jack kidnaps Elwood to find out what he's up to; Bozer's feelings toward Leanna grow stronger.

The LAPD interrupts the team's Christmas celebration to arrest Mac for terrorism when they find a body in a building destroyed by a bomb Mac built.

When Mac's nemesis rigs Mac's house with explosives and traps him and Jack inside, Mac uses a karaoke mic and an audio transformer to let the team know that the bomb is a distraction for a bigger one.

When bodies turn up in Indiana cornfields, the team must catch a pack of serial killers targeting exotic dancers.

The team tries to stop a killer from striking again after the body of a kidnapped woman is found in an alley.

When an 8-year-old is found dead on the Appalachian Trail, the team searches the forests for a man targeting children.

The team pursues a killer who targets women; Hotchner turns to an FBI cadet for help.

After helping a man get parole, Morgan regrets his decision when the man murders someone shortly after being released.

A series of bizarre, ritualistic murders brings the team to Miami; Reid experiences hallucinations and blinding headaches.

The team pursues two young lovers on a killing spree; Prentiss receives frightening news.

The team investigates unusual murders in Los Angeles, and more information about Prentiss' past arises.

The BAU heads to upstate New York to investigate mysterious disappearances; Prentiss receives troubling news about a former colleague.

Reid's ability to connect with an autistic child may prove helpful in finding the boy's missing parents; two former colleagues help Prentiss search for an old adversary.

After a series of murders, Prentiss becomes suspicious of a former nemesis (Sebastian Roché) and fears for the safety of her team.

Prentiss prepares to confront her nemesis at last; the team asks J.J. to help find Prentiss and capture Doyle.

The team must stop a gang of suspected murderers that is targeting a new victim nightly.

The team must investigate targeted killings in Florida while each member is dealing with feelings about losing Prentiss.

A stalker in San Diego targets college students; Strauss scrutinizes the team after the loss of Prentiss.

The team travels to a North Carolina town where one woman was found badly injured and another is missing, and discovers those may not be the only victims.

As part of the witness protection program, a special agent gains a new identity as truck driver Chance Bowman.

An encounter at a truck stop embroils Chance Bowman in a widow's problems and an altercation with the local police.

A minor accident delays Chance Bowman from moving on and introduces him to a talented mechanic with a tainted past.

After a near-miss encounter with a hit man, Chance decides to stand and fight Calder.

The team must save Cabe when he is captured during a secret mission in Djibouti, Africa, with his protege, Tim Armstrong (Scott Porter).

A deadly tornado threatens the lives of Team Scorpion during a mission to recover the remains of fallen Marines in Vietnam.

The team is hired by the Department of Defense to test the security at Fort Knox by trying to break in and steal a precious artifact.

In Chernobyl, Sylvester and Paige become trapped inside a decaying nuclear reactor that the team is trying to repair before a tragic meltdown.

The team must outsmart mentally unstable ex-Scorpion member Mark Collins when he kidnaps Toby and threatens to kill him if his demands are not met.

The team members set aside their personal and romantic issues when hackers take over targeted U.S. military aircraft and war ships, pointing the weaponry at American cities.

The team members set aside their personal and romantic issues when hackers take over targeted U.S. military aircraft and war ships, pointing the weaponry at American cities.

When Walter is accidentally launched into space in a rocket, Team Scorpion must find a way to bring him home before his oxygen runs out.

While in the hospital after being shot at the lab, Brennan struggles with visions of her mother that defy her usual logic; evidence may link Brennan's attacker to the Jeffersonian.

As the team investigates the death of a seemingly innocent 15-year-old boy, they learn that he was involved in illegal activity.

When a well-educated but eccentric intern starts working at the Jeffersonian, Brennan tries to be more open-minded about scientific questions.

The team investigates the death of a young man whose remains were found at a hazardous waste disposal facility; Cam and Arastoo struggle to keep their relationship secret; Brennan and Booth try to decide where to take their vacation.

The investigation into the death of a former Marine leads the team to a group obsessed with preparing for the apocalypse; Sweets finds an apartment.

The team investigates when an undercover cop turns up dead with a bag of diamonds inside his body; Brennan struggles to be likable as the subject of a documentary film.

The team investigates when a TV producer is murdered; Christine is accused of biting a classmate; Hodgins uses his tools at the Jeffersonian to chemically re-create Finn's hot sauce.

The team investigates when a stock broker -- who moonlights as a stripper -- is murdered; after a 24-year absence, Booth's mother (Joanna Cassidy) shows up with a request.

The team tries to prevent a viral outbreak during an investigation into a journalist's murder, whose infected body is found at a biohazard facility; when Arastoo Vaziri is affected by the mutated virus, the only way to save him is to solve the case.

Christopher Pelant returns to toy with the Jeffersonian team; an investigation reveals a string of murders tied to FBI agents; Brennan evaluates her relationship with Booth.

The remains of an accountant for the state department are found in a hotel air conditioning unit; Booth finds an Army buddy and CIA agent, Danny Beck, removing evidence from the victim's condo; Brennan contemplates her future with Booth.

The investigation into the murder of a management consultant whose remains were partially eaten by bobcats leads to a marriage retreat site; Cam's identity is stolen; Sweets decides to take a leave of absence.

Toby and Michelle investigate the death of a pharmaceutical executive who released a drug with killer results.

Toby and Michelle must recapture an escaped criminal mastermind before he can seek revenge.

Toby starts doubting his abilities after Michelle questions his insights during their investigation into a wealthy philanthropist's murder.

Toby and the IIB must find the source of a deadly virus before it kills more people.

The team investigates the dangerous world of personal security when a rap star's (Xzibit) bodyguard is shot and killed during a concert.

Horatio goes to New York to work with his counterparts on a murder investigation. Guest star Gary Sinise.

All evidence points to the film distributor, who also happens to be a registered sex offender, in the investigation of an adult film star's murder, but an accident at the lab may taint a key piece of evidence.

When a man is murdered as he tries to pay his son's ransom with $3 million worth of jewels, the CSI team is called to investigate and one member of the group is killed in the line of duty.

A drive-by shooting from a boat leaves a beach partier dead, and the CSI team protects the 8-year-old witness during the search for the killer.

When a young woman is pushed in front of a moving bus, the CSI team suspects her boyfriend; Calleigh's father fears he may have killed someone after a night of drinking.

After students use e-mails and text messages to organize a spontaneous gathering at a golf course, the body of a high-school senior is found.

The CSI team tracks the killer of an 18-year-old woman, an investigative aide for Alcohol Beverage Control who was monitoring underage drinking when she was murdered at a hip Miami nightclub.

J.J. is shaken after investigating the case of two abducted children, and tells her husband about the events.

As the BAU welcomes back Emily Prentiss, they're called upon to investigate the disappearance of three women.

The team searches for a serial killer along the Appalachian Trail in rural Virginia.

The BAU investigates the case of two murdered families, where two high school students are the sole survivors.