Spies pursue a stolen diary aboard the Orient Express.

In 1940 Sally Maitland is forced to leave England, ostracised as a Nazi sympathiser by everyone including her well-to-do family. On the ship to Halifax, Canada, she is courted by Polish aristocrat Jan Orloch and by awkward British navel intelligence officer Jimmy Garrick. She shows herself somewhat more amenable to Orloch's advances, and agrees to meet his mother in Halifax. Once there however, it becomes clear no-one is really who they say they are.

Berlin provides the backdrop for this crime drama that centers on a military doctor falsely accused of dealing illegal drugs. Determined to prove his innocence, he escapes from the MPs and ends up holing up in the apartment his wife rented. He doesn't know that she has sublet the flat to a nightclub singer. When he finds out, he begs the singer to assist him. She is attracted to him and agrees. The doctor believes that his wife is behind the black-market dealings, but in the end, they find the real culprit.