The beginning of all slasher films; spurring the slasher genre of the late 20th century. This Canadian horror/slasher feature sets in a sorority house with strange obscene phone calls which escalate into missing child case, a missing sorority sister setting the tone for murder and mayhem. Starring Olivia Hussey, Keir Duella, John Saxon and Andrea Martin shining in the cult classic gaining popularity in the decades follow.