After a fourth woman goes missing in as many months, the team is brought in to track down the guy before he kidnaps again. Hotch is asked to secretly evaluate Gideon to see if he is ready to work full time again.

The BAU investigates the kidnapping of a U.S. District Attorney's daughter and determines the kidnapper isn't seeking money -- he's after her twin sister.

The BAU profiles a serial killer who takes families hostage and lives with them as a father figure during what is supposed to be their family vacations.

The BAU team travels to Mexico to aid in the capture of a serial killer who is targeting elderly women.

While on their vacations, each of the team receives a clue from a psychopathic killer challenging them to save his next victim.

The BAU is called to investigate a series of bank robberies after it becomes evident the crimes are not based on money because the robber abuses his victims by forcing them to undress before he leaves the crime scene.

Gideon, Reid and Prentiss travel to Guantanamo Bay to interrogate the leader of a terror sleeper cell being detained there after a chemical weapons dispersal device is discovered during a raid at a suspicious house. Working with Reid, Emily's fluency in Arabic proves to be useful as they scrutinize the suspect.

The BAU is called to investigate after a wealthy couple is murdered in their home following a Super Bowl party.

In Milwaukee, a series of women have been found murdered with their hearts crudely removed. The BAU is assigned to the case, but they are short three members: Gideon, who is missing, Hotch, who is on suspension and Prentiss, who resigns her commission to join the Foreign Service. Supervisor Strauss steps in as lead, but she doesn't handle herself well in the field.

The BAU travels to Portland to assist local authorities in investigating the disappearances of people who are new to the city and have no strong social ties.

When home invasions involve the murder of entire families, the BAU is called to Denver to identify the killers who possibly have been abused while in foster care.

The investigation turns to the family as the BAU and local authorities race against time to locate a young girl who has disappeared from a local shopping mall.

As Rossi, Morgan and JJ profile a killer who is targeting an emergency room doctor, Prentiss realizes that Hotch is missing.

The BAU team races to help Hotchner find The Reaper and save his family before it's too late.

The team needs to reunite in order to solve a home invasion case, while Agent Hotchner may have to leave the team.

As Hotch fights for his life due to complications from his stabbing at the hands of George Foyet, a.k.a. "The Reaper," he experiences visions of his late wife, Haley, and his nemesis, Foyet. Meanwhile, the BAU searches for a missing teenager and investigate her estranged father as a suspect in her disappearance.