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

The BAU must catch a group of serial killers that is killing exotic dancers and leaving their bodies in the cornfields of Indiana.

The BAU becomes involved in the search for a kidnapped woman in the nation's capital after the body of a second kidnap victim is found in a Georgetown alley.

When an 8-year-old is found murdered on the Appalachian Trail, the BAU team goes deep into its forests in search of a man lurking in the wilderness who is targeting children.

The BAU searches inside a gated New Mexico community for a killer targeting women, and Hotchner looks to an FBI cadet with a unique past for help with the investigation.

Morgan suggests that a man has been rehabilitated and aids in his parole, but later regrets his decision when the man murders someone days after being released.

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

The BAU hits the road to track down a pair of young lovers on an interstate murder spree. Also, Prentiss hears frightening news from her former boss at Interpol.

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