Edmundo Nobile invites friends over for an opulent dinner party. While the guests enjoy their food, the servants disappear one by one. Afterward, the visitors retire to the salon for an evening of music and conversation -- but in the morning, they are mysteriously incapable of leaving the room. As days go by and they run out of food and water, panic and madness set in. The army and the police arrive, but fail in their attempts to enter the house as conditions inside deteriorate.