Rich knowledge, charming dances, and handsome drummer Stephen (Cam Gigandet) make Sarah (Minka Kelly), a girl who has just entered college, excited, and her friendly roommate Rebecca (Leighton Meester) makes her college life seem even more perfect. However, life is not as peaceful as it seems. Rebecca's perverse personality gradually reveals that she not only threatens Sarah's close friend Trish (Alyson Michalka) to stay away from Sarah, but also cruelly kills Sarah's pet cat because Sarah is moving away. Rebecca's weird possessiveness makes Sarah feel terrified. She finally can't stand her sick roommate and decides to stay away from it all, but things are not that simple... This film brings together handsome men and beautiful women from several popular American TV series, and is based on real reports in newspapers, which has accumulated enough gimmicks for the film before it is released.