A perverted killer specifically targeting the BAU team appears and sets a series of rules for the team members. They race against time to track one clue after another to save the life of a hostage girl. The suspense of the previous season is left to be answered in the first season of this season. In this season, in addition to using behavioral analysis methods to solve serial killer cases, the BAU team members are also touched on more private lives, such as Dr. Reid (Matthew Gray Gubler) and his mother in a mental hospital; Alan Hatch (Thomas Gibson)'s marriage problems, etc., and Al Greenway (Lola Glaudini) regrettably left his post, but there is also a strong new beautiful member Emily Plettis (Paget Brewster) who has become a new blood of the team...