Beth is about to join a sorority, but in the dormitory she begins to be haunted by nightmares and visions of a knife-wielding maniac. Through a hypnotic experiment, the girls learn that when Beth was a little girl, she lived in this very same house. She was the only survivor when her older brother Bobby slaughtered the entire family. One day, when the other girls have gone on a weekend getaway, Beth and her three friends decide to invite some guys they know. They don't know yet that Bobby has escaped from a mental institution.