The team is called in to find three children who went missing during a bike ride and may be connected to an unsolved crime from thirty years ago.
The team heads to the Appalachian Trail in rural Virginia in search of a serial killer operating around it. Meanwhile, Reid is faced with a dilemma involving his mother's health.
Prentiss rejoins the team to help them solve the murders of two single mothers who were found incased in barrels of concrete.
Prentiss returns to enlist help from the team in tracking down an international serial killer when she believes that the next victim will be on American soil.
The team must act fast to find out who is targeting the BAU.
The NSA invite the BAU in to investigate an underground Internet drug syndicate after the murders of two undercover DEA Agents and the disappearance of another.
Rossi's daughter, Joy, asks the BAU for help in an investigation involving a missing college student. Meanwhile, the team discovers that Giuseppe Montolo has died in prison after warning Morgan about the Dirty Dozen, and JJ returns from maternity leave.moreless
When body parts are found in Detroit graffiti, the team looks for the UnSub in the underground art scene. Meanwhile, new profiler Tara Lewis works to balance her work and time with her fiancé.moreless
The team hunts a hit man who is murdering his former clients. Meanwhile, Hotchner needs to fill a profiler position and interviews several candidates.