Briarwood Manor, 1920s. The owners of this Art Deco estate have assembled six of the most famous detectives in the world as guests, along with the detectives' personal friends and family members. The event is a murder party — a staged mystery designed as entertainment, built around a mock murder for the detectives to solve together for fun. Someone commits an actual murder before the staged version can begin. The real case has to be solved before time runs out and the killer escapes.