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In a large Victorian house outside of London, Mumsy and Nanny encourage teenagers Sonny and his sister Girly to bring strange men home as playmates. The victims are held captive until the four decide to murder them. On one of their forays, Sonny and Girly see a young man and his date drunkenly leaving a party. Girly invites the couple to play with them at a playground, where Sonny murders the young man's date and convinces him that he was responsible. "New Friend," as he is now called, is brought to the house under the threat of blackmail and soon learns of the strictly enforced rules of the house which, if violated, could result in a fate similar to that of "Friend in #5" who was murdered by bow and arrow. "New Friend" joins in the deadly games in order to attempt an escape; in addition to the permissible lovemaking with Mumsy, he seduces Girly and Nanny to create discord in the family. Girly bludgeons her jealous brother to death for his threats against "New Friend" and then beheads Nanny. Girly and Mumsy finally arrive at an agreement to share "New Friend," but he plots to do away with both of them.