An unseen and disoriented man climbs up into the attic of a sorority house, where the tenants are celebrating with a Christmas party. One of the girls, Jess, answers an obscene phone call from a mentally unstable man who is implied to call the house regularly. She summons her fellow students into the room, where they listen as the caller screams and curses them on the phone. When one of the girls, foul-mouthed Barb, takes the phone from Jess, she incites the caller, who in turn promises to kill her. Barb argues with a younger student, Clare Harrison, who implies that the caller could be a serial rapist, before Clare returns to her bedroom to finish packing for Christmas break. The disoriented man lures Clare into her closet, where he suffocates her with a plastic dress bag. He moves her body to the attic.