The Secret Door (1964)
World War II espionage in Lisbon with Allied safe-crackers cultivating a master spy and his wife so they can steal Japanese codes that are keys to Axis battle plans.
- Country : United Kingdom, United States of America
- Genre : Thriller
- Studio : Dorton Productions, Tifeshire Productions
- Director : Gilbert Kay
- Cast : Robert Hutton, Sandra Dorne, Peter Illing, Peter Allenby, George Pastell, Martin Benson