Michael Canavan

With Derek away, Meredith spends time with Amelia and finds out her true feelings about her time in Seattle. Bailey deals with the ramifications of her actions and Callie receives devastating news. Meanwhile, the residents panic after hearing that one of them will be fired.

The BAU team investigates the mass murder of college students, similar to wartime methods used by a Native American tribe long ago.

A group of teenagers are driving on the freeway when a skull smashes through their windshield. At the Jeffersonian lab, Brennan tests out a young forensic anthropologist to replace Zack, who has left for Iraq, and she and Cam examine the skull in question. They find it has marks made by human teeth, suggesting cannibalism. The team identifies the victim, a known violin protégé who disappeared after a concert. On a quest to find out what happened to him, Brennan and Booth go into the field. A trail of suspects leads them to a strange cannibalistic society, and the team must string together a gruesome and cryptic series of crimes – provided that Brennan and Booth can survive the newfound tension between them. Meanwhile, Cam suggests that Angela hire a private investigator to track down her ex-husband so she can annul her previous marriage and marry Hodgins, a task easier said than done.

Frasier and Niles desperately search for a wealthy patron to lend financial support for their failing former prep school. Their best hope appears to be an affluent matron - especially since Martin is involved with her.

Sydney starts to question Will's identity after he's arrested for espionage as a suspected double. Sark and Irina plot to recover the Rambaldi heart.