A horror/thriller film trailer is outlined that tells the story from the killer's point of view. The main character, Madeleine Blackwell, chases her dog into an abandoned church where she becomes possessed by a mysterious shadow. She begins having blackouts and nightmares that may be more than just dreams. As her frenzied states start, she kills her family and friends with no memory of what happens. Her sister helps keep her secret but also meets her demise. The narrative explores whether Madeleine's violent acts are truly her own or being committed by the demon that possesses her.