James Mason stars in this film about stealing state secrets. Mason's character, Diello, is the valet to the British ambassador to Turkey. But he hates the British and steals classified documents from the ambassador's safe by photographing them. He offers them to the Nazis, who buy them, but doubt their veracity. Diello, as played by Mason, has all the oily charm of a man who wants to be a "gentleman." His opposite number, Moyzisch, the German attaché, is portrayed as something of a bumbler. But Franz von Papen, the German ambassador to Turkey, is portrayed as smart and impatient with the incompetents around him. The story is based on a post-war memoir by German attaché L.C. Moyzisch, who had dealings with the British embassy spy.
