After a fourth woman goes missing in Seattle in a period of four months, the BAU is brought in to track down the abductor before he kidnaps again.

The team of investigators tries to capture a serial arsonist who has been terrorizing a college campus in Tempe, Arizona. Most of the evidence from the fires had been burned beyond recognition, so the BAU must rely on psychological analysis to identify the firestarter.

Gideon and the BAU track down a copycat bomber who has been terrorizing Palm Beach, Florida. The team determines the bomber is mimicking Gideon's nemesis, Adrian Bale, who is the man responsible for murdering Gideon's team in Boston several years earlier.

The BAU travels to San Diego to stop a rapist and murderer who commits his crimes in the middle of the day. The suspect appears to blend into the neighborhood so well the local authorities have been unable to capture him.

The Behavioral Analysis Unit quickly determines that the kidnapper isn't after money -- he's after the victim's twin sister. Now, they must determine how to save the original victim without putting her twin in danger, which becomes even more complicated when it becomes obvious that the kidnapper is somehow always a step ahead of them.

The BAU is asked to identify a killer who is shooting at victims in broad daylight, and the team works with local law enforcement officers to recreate one of the shootings.