Starring Olivia Hussey, Keir Dullea, Margot Kidder, Andrea Martin, Lynne Griffin and John Saxon...The story follows a group of sorority sisters who receive threatening phone calls and are eventually stalked and murdered by a deranged killer during the Christmas season. Inspired by the urban legend "the babysitter and the man upstairs" and a series of murders that took place in the Westmount neighbourhood of Montreal, Quebec.