Comedy horror starring Kathryn Newton and Vince Vaughn. When notorious serial killer The Butcher (Vaughn) picks his next victim in high school student Millie (Newton) a strange turn of events causes them to swap bodies. With The Butcher now in Millie's body and Millie now in The Butcher's, it appears that a high school student is embarking on a killing spree and a middle aged man is trying to stop her. Can the real Millie get anyone to believe her story before it's too late?