Directed by the director of "Happy Death Day", the film tells the story of a high school girl and a middle-aged male serial killer exchanging bodies: the girl Millie becomes the new target of the town's notorious killer The Butcher. His mysterious ancient dagger failed to kill Millie, resulting in the two exchanging bodies. She realizes that she only has one day to change it back, otherwise it will be irreversible. The Butcher discovers that the girl's body is the perfect cover for his killing spree, and the two use all their skills to fight wits and courage.