Passport to Treason is a 1956 British mystery thriller. It stars Rod Cameron, Lois Maxwell, and Clifford Evans. It was directed by Robert S. Baker and written by Kenneth R. Hayles and Norman Hudis, based on the Manning O'Brine novel of the same name. Plot After the death of a friend of his, a private investigator investigates an organisation that claims to be working for world peace, but turns out to be a front for a crime syndicate. Cast Rod Cameron as Mike O'Kelly Lois Maxwell as Diane Boyd Clifford Evans as Orlando Syms Peter Illing as Giorgio Sacchi Marianne Stone as Miss 'Jonesy' Jones Douglas Wilmer as Dr. Randolph John Colicos as Pietro Ballard Berkeley as Inspector Thredgold Andrew Faulds as Barrett Barbara Burke as Katrina Derek Sydney as Amedeo Sacchi Trevor Reid as McCombe Neil Wilson as Sergeant Benson Peter Swanwick as Cafe Proprietor Hal Osmond as Club Barman Salvin Stewart as Travel Agency Manager Anthony Baird as Nursing Home Orderly Tom Bowan as Bargee Sources "Passport to Treason" at Moviefone.com. "Passport to Treason" at Ffilms.org References External links 1956 films 1950s mystery films British black-and-white films British mystery films Films directed by Robert S. Baker Films shot at Nettlefold Studios 1950s English-language films 1950s British films