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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.
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.
The team hunts a hit man who is murdering his former clients. Meanwhile, Hotchner needs to fill a profiler position and interviews several candidates.