Husband Ethan and daughter Lily are across the street buying ice cream when Ethan receives a frantic call from his wife Nora, who is home alone. Nora warns that Sheriff Booker's rule about not opening the door after 8 PM is correct and insists they return immediately, threatening them not to come back at all if they don't. Ethan reluctantly abandons the ice cream to rush home. As they arrive, Nora screams a final, desperate warning: "No matter what, don't open the door." The family is now gathered outside their home, facing an unknown threat with a strict, ominous curfew in place.