When the body of a local college fraternity student is found gruesomely murdered, Castle has to go undercover as a professor in order to gain access to the victim's world. However, he and Beckett soon discover that behind the fun and games of college are some darker secrets the university wants to keep hidden.

Cast: Jeff Davis, Seamus Dever, Nathan Fillion, Jon Huertas, Stana Katic, Herbert Russell, Eric Satterberg