Series of murders in San Francisco bearing the tell-tale signs of the infamous Zodiac Killer have the BAU wondering if the notorious serial killer has returned. Also, Reid ponders if he should be doing more with his genius abilities.

The BAU tries their luck in Atlantic City when the team is called in to investigate a series of ritualistic casino-related murders. Also, after a spat with her boyfriend, Kevin, Garcia thinks she and Morgan may have gotten a little too friendly with each other.