There she becomes involved with a Polish officer (Albert Lieven) while British officer Richard Greene keeps an eye on her.
However all is not what it seems, Sally is really a deep cover agent and Albert is the spy. Sally's mission is to penetrate a spy ring and foil a devastating Nazi plot. That and other twists elevate this film above standard wartime propaganda fare. There are some good performances too including from Margaret Rutherford who provides a bit of light relief.
