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.

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.

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.

A pregnant woman researching her family history realizes that her great-grandmother, Violet Holley, died in an unsolved murder. Rush tackles the 1929 case, her oldest to date, but she finds only a few notes revealing that underprivileged Violet had become pregnant by a wealthy man, Nick Bartleby.

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 meets Rabbi Dave's friends.