In the 1970 British horror film “Mumsy, Nanny, Sonny and Girly,” four eccentric inhabitants of an isolated English manor spend their days playing a bizarre family game with dangerous consequences. Sonny and Girly lure unsuspecting strangers back to the estate, where the visitors are forced into the household’s strange rituals. When a cynical outsider arrives and begins manipulating the family dynamics, tensions inside the manor quickly spiral into violence and dark comedy.