An American car salesman in England receives a mysterious invitation from an eccentric millionaire to visit his old house, where he lives with his twin brother. Soon, the guest finds himself drawn into a bizarre and sinister family gathering. Cast: - Tom Poston as Tom Penderel - Robert Morley as Roderick Femm - Janette Scott as Cecily Femm - Joyce Grenfell as Agatha Femm - Mervyn Johns as Petiphar Femm - Fenella Fielding as Morgana Femm - Peter Bull as Caspar/Jasper Femm - Danny Green as Morgan Femm - John Harvey as Club Receptionist - Amy Dalby as Gambler (uncredited) Runtime: 86 minutes