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When the fourth woman in four months disappears in Seattle, the team are brought in to profile her captor. On his first job in six months after his last ended in disaster, Gideon assists the team while under the watchful eye of Hotch.

Gideon seeks help from a psychologist, hoping to use their professional analysis to track down an arsonist who set fire to a college campus and left very little evidence behind.

While investigating a serial bomber's attack on a small town, Gideon learns that the perpetrator is a protege of his nemesis, who had murdered his previous team of profilers.

The unit travels to San Diego to profile a rapist and murderer who attacks his victims in affluent neighbourhoods in broad daylight.

The unit are called in when the daughter of a district attorney is kidnapped. It soon becomes clear that the kidnapper is not after money, but the victim's twin sister.

The team recreate a shooting in order to catch a sniper who preys on victims in the middle of the day. However, a shocking turn of events causes them to quickly change their original profile.

The team profile a man who targets families on holiday by holding them hostage and acting out strange father-figure fantasies with them.

When an undercover cop goes missing, the police suspect the mob are to blame. However, the team thinks that a serial killer whose job is making mob hits may be a more likely suspect.

A group of train passengers, including Elle, are taken hostage by a paranoid schizophrenic. Dr. Reid attempts to convince the man that he agrees with his theories in order to get the hostages to safety.

The suspicious deaths of two high school students in a small town lead Hotchner and the team to believe they were victims of a cult killing.

Hotchner and the team try to see through the eyes of a psychotic killer whose deranged fantasies make him kill and drink the blood of his victims.

When the victim's father is ruled out as a suspect in a kidnapping case, the unit investigates the seemingly safe neighbourhood in which the child lives for clues as to who is responsible for the young girl's abduction.

The apparent spiking of the citizens of a town in New Jersey puts the BAU on the trail of a poisoner who may not be finished.

After interviewing a married couple sitting on death row for serial murder, Gideon suspects the woman is actually innocent. However, since she's set to be executed in two days, it's a race against time to prove it.

Following a 20-year period of silence, a serial killer re-emerges, contacting the BAU with a guarantee to kill another victim before five days are up.

The BAU team investigate the murder of five college students, a killing that bears a resemblance to the wartime methods of a Native American tribe.

The NYPD are investigating what they believe to be a series of random murders until links are drawn between the crimes and similarities emerge; the police suspect that a copy cat serial killer may be emulating the infamous Son of Sam murders.

Gideon and Reid are visiting Los Angeles to present a seminar for the LAPD when they and the rest of the Behavioural Analysis Unit are brought into a case involving the murders of several people linked to a young, television actress.

The team face opposition from the local law enforcement in charge of a murder investigation; when another victim is discovered, the two teams find a common ground and collaborate to identify the killer before further violence is perpetrated.

A killer with a number of identities leads the authorities on a baffling chase through the South; the Behavioural Analysis Unit has a tricky job on their hands as they attempt to profile the man beneath the rapidly changing exterior.

The team attempt to uncover a CIA mole who is endangering the lives of operatives; during the investigation the CIA takes over the Behavioural Analysis Unit offices to prevent further electronic leaks which puts further pressure on the team.

The squad are led into a psychological game with a budding serial killer, who challenges them to solve a series of complicated clues in order to prevent the murder of his next victim.