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When Emily Prentiss confronts her nemesis, Ian Doyle, and goes missing, Jennifer "JJ" Jareau is asked by the BAU to help find Prentiss and capture Doyle before it is too late.
When a series of unusual murders occurs in Los Angeles, the BAU travels there to investigate. Meanwhile, more of Prentiss's mysterious past is revealed.
The BAU becomes involved in the search for a kidnapped woman in the nation's capital after a woman dressed like a 1950s starlet is found murdered in a Georgetown alley.
The BAU is called to apprehend a killer who has struck Detroit for the past three years during Devil's Night, the notorious pre-Halloween celebration.
In the conclusion of last season's cliffhanger, the BAU pursues Billy Flynn, who has kidnapped Det. Spicer's daughter and continues his murder spree throughout the city of Los Angeles.