When a prank results in the accidental death of a Theta Pi sister, the sorority's members keep the crime under wraps. But as graduation rolls around, a masked killer begins stalking and slaying the girls responsible for the death. Someone is out for revenge, but who could know about their dirty little secret? Jamie Chung, Rumer Willis and Audrina Patridge ("The Hills") co-star in this not-so-sisterly slasher flick.