Lois Conway (Williams) works as a music teacher at a local high school in a small town, where recently a woman was found murdered. When she starts receiving notes from an anonymous admirer, she suspects her favorite student Sandy (Wilder) is responsible, and tells him they could never be lovers. The notes grow more violent and when, in her latest letter, she is invited to meet at the school's lockers at night, Lois decides to visit, hoping to stop the young man. There, she is attacked by an initial shadowy figure, whom she later identifies as Leonard Bennett (Saxon), the high school's star football player.