Sexy, teenaged, immature Girly and her camera-wielding brother Sonny [a wealthy, fatherless British clan] kidnaps bums and hippies and brings them home to Mumsy and Nanny, where they play elaborate role-playing games in which they are the perfect family. Those who refuse or attempt escape are ritualistically murdered. One day they bring home a new friend who has a few ideas for games of his own, though, and he begins to turn the foursome against each other