A freshman at a California college, Sara (Minka Kelly, 31 years old) is ready for the real world after her stifling Iowan upbringing. Her dorm roommate is Rebecca (Leighton Meester, 25 years old), a gifted artist with a major overprotective streak, looking to bond with Sara in a big bad way. As the fashion design major becomes acclimated with the campus and its sisterhood cliques, Sara finds love with date rapist/frat hunk Stephen (Cam Gigandet, 29 years old), further disrupting Rebecca’s dreams of intense bonding. As the months pass, Sara grows increasingly aware of her roomie’s possessive behavior, which soon spills over to violence once Rebecca senses Sara is looking to move out.