A man in London tries to help a counterespionage agent. But when the agent is killed and he stands accused, he must go on the run to both save himself and also stop a spy ring trying to steal top secret information.
It's melodrama and at times far-fetched and improbable, but the story twists and spins artfully from one high-powered sequence to another while the entertainment holds like steel cable from start to finish.
Surprisingly fast-paced for a 1935 film, full of twists and turns, and when the unlikely couple becomes handcuffed together and are forced to pretend they are married, it really kicks into high gear. Donat and Carroll have chemistry to burn.