Jeff Newburg

A 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.

Lightman becomes obsessed with his investigation of two young women who committed suicide. Meanwhile, the team tries to recover billions of dollars for investors who were bilked by a Ponzi scheme.

Tori struggles to find the perfect birthday gift for Trina, then decides to write her sister a song as a present. An ungrateful Trina turns the song into cash by selling it, enraging Tori.

During the holiday season, Lightman goes to Afghanistan to assist in a mission to rescue two captured marines, and his only source of intelligence is an American expatriate.

Nancy;Andy;and Silas take a trip.

Nancy meets Rabbi Dave's friends during an awkward Shabbos dinner. Andy brings home a very special guest to meet the family. Silas prepares for his new business venture. Shane and Angela attempt to retrieve some stolen property. Meanwhile, Doug's homeless group threatens to leave him if he doesn't begin catering to their needs.