The BAU heads to St. Louis, Missouri where ten year old Andrew Taffert has gone missing. The reason it is a BAU case is that the Tafferts - father Malcolm Taffert and mother Lida Taffert - had been receiving prank calls...
Supervisory Special Agent Jason Gideon returns to the Behavioral Analysis Unit after an extended medical leave, and BAU team leader Aaron Hotchner must secretly evaluate Gideon's performance. Gideon's first case upon his return involves tracking down an unsub (unknown subject) in Seattle before he kills his latest kidnap victim.
One of a lawyer's identical twin daughters is kidnapped. The kidnapper contacts him and demands ransom money. The team's investigation, however, reveals that he doesn't really want the money, but both girls.
The BAU team investigates a CIA counter-terrorism unit to identify a traitor who had a fellow agent murdered and who is trying to find and kill the unit's informant, a Saudi woman with two children who are in hiding.