A group of ten people gather at the mansion on Soldier Island, just off the coast of Devon. They are invited under a variety of pretenses: for employment, for a detective case, or just for a good time. Before the party truly gets under way, a recording plays that accuses each guest of murder. Baffled, these strangers realize that they have no idea who their host is, and when the first guest is murdered, they understand that they have been brought to the island by a maniac who intends to dispense his own perverted form of justice.