Billy, a young boy whom his mother as a child abused, while his mother was cheating on Billy’s father, she eventually kills his father and kept Billy locked in the attic, while she was with her lover and starting a new family. Billy’s mother became pregnant and treated her with love, which Billy had never experienced with his mother; Billy came out of the attic after years and viciously murdered his mother and her lover. Present day, a group of eight sorority sisters, who now live in Billy’s childhood home, find themselves harassed by threatening and intimidating phone-calls during Christmas Break and as one of the girls goes missing, the girls begin being murdered one by one.