The last night before the Christmas holiday, the sorority sisters of Pi Kappa Sigma have one last party before they all leave for the holidays. The mood of the party quickly changes when "The Moaner," a man who has harassed them for a while, calls them once again. The girls decide that the party is over and head to their rooms, trying not to think too much about it. The next morning, they discover that one of the girls has gone missing. They try to go to the police and explain that the calls might be connected to the disappearance, which they don't believe until the body of another young girl is discovered in the park.