The Secret of Stamboul (The Spy in White) (1936)

Secret of Stamboul, also known as The Spy in White, is a 1936 British thriller film, taken from the novel The Eunuch of Stamboul by Dennis Wheatley, directed by Andrew Marton and starring Valerie Hobson, James Mason and Frank Vosper. It was made at Shepperton Studios. The screenplay concerns a British agent who tries to thwart a revolution.