Seven strangers wake up in an abandoned sanatorium, only to find themselves trapped in a three-day survival game. Every night at 22:00, they have to vote one person out; from 00:00 to 6:00 in the morning, no matter who calls your name outside the door, you must not answer or open the door. There are only eleven rules, but every single one of them can be fatal. Three "bad guys" are hiding among them — they do not kill directly, they can only take lives by leveraging the rules. Ethan, a detective, can see through lies with his lie-detecting skills, but he can never fully fathom the human heart. When dawn breaks, who will make it out of this silent night alive?
