Veteran officer Robert Sharkey is recruited to train a team of intelligence service agents. When one of them turns out to be a German mole, Sharkey feeds him misinformation to take back to the Gestapo. However, the rogue spy outsmarts his peers and murders an agent. Without time to recruit a replacement, Sharkey steps in to head a dangerous mission in the heart of Nazi-occupied France. Second World War thriller, with James Cagney, Richard Conte, Walter Abel, Frank Latimore and Annabella.

Bob Sharkey, an instructor of would-be spies for the Allied Office of Strategic Services, becomes suspicious of one of the latest batch of students, Bill O'Connell, who is too good at espionage. His boss, Charles Gibson confirms that O'Connell is really a top German agent, but tells Sharkey to pass him, as they intend to feed the mole false information about the impending D-Day invasion.