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.
When an undercover cop in Baltimore involved in a mob investigation goes missing, the BAU believes a serial killer rather than organized crime has something to do with his disappearance. The probe leads to several unsolved missing persons cases.
Elle, along with many others, is held hostage on a train in Texas by a paranoid schizophrenic who is convinced that the U.S. government is monitoring him. Hotchner and Gideon are forced to play into the man's fantasy to save the people he has taken hostage.
When a young girl is abducted in broad daylight from a playground in a seemingly safe neighborhood, the BAU team initially believes her father is responsible. When he is able to provide an alibi, the team is forced to look for clues where the girl lives to determine who is really responsible.