Tom Choi

The Behavioral Analysis Unit must help identify and catch a serial bomber terrorizing the city of Seattle. Through their investigation, the BAU meets Professor Kent (JoBeth Williams), the author of a science fiction novel that denounces technology and has become a type of guidebook for the bomber. With her help, the team attempts to figure out why these sites are chosen as targets before anyone else is seriously injured.

The remains of a teenage runaway are discovered and his parents think he was murdered by his "wrong side of the tracks" girlfriend.  When it becomes apparent that she is interested in tragic love stories, i.e., addicted to Romeo and Juliet, Bones and Booth are about to concur, but new evidence leads them to believe a man helping runaways may be involved.

Cristina’s encounter with a former nurse, now a patient at Seattle Grace, changes her forever; Derek and Meredith treat a construction worker who has miraculously survived an injury but is now faced with tough decisions about his future; and a patient recognizes Izzie from a lingerie ad, which makes her the subject of hospital gossip.

At a state wedding, Lightman and his team work to prevent the assassination of a South Korean ambassador. But when someone else is shot, Lightman exposes long-held family secrets and lies to identify the assassin.

In the winter finale, the federal lawsuit against Brenda comes to a head when another murder occurs that is related to Turell Baylor's death. Brenda seeks help from a businessman (guest star JASON GEORGE – GREY'S ANATOMY) with old ties to the neighborhood for help solving the case. Meanwhile, Brenda's lawyer (recurring guest star MARK PELLEGRINO) and the Baylor family lawyer (recurring guest star CURTIS ARMSTRONG) face off in court.