Plot
Free French Captain Pierre Matard (Aumont) is assigned the task of locating a concealed U-boat pen in occupied France. He is chosen due to his striking resemblance to Bertrand Corlay, a suspected Nazi collaborator being held prisoner by the British.
At the Corlay family farm, Madame Henriette Corlay (Margaret Wycherly), Bertrand's mother, eventually realizes Matard is not her son, but does not give him away, although she disapproves of Bertrand's apparent cooperation with the Germans. Matard has better luck fooling both Anne Pinot (Susan Peters) and Elise (Signe Hasso), Bertrand's fiancee and mistress, respectively.
After French Resistance contact Louis Basdevant is unmasked as a turncoat, Matard forces him at gunpoint to get him into a heavily guarded town. When the masquerade is uncovered, Matard shoots Basdevant and a German officer, and escapes by jumping in the harbor. He sees a U-boat entering a hidden pen.
He gives a coded message to Plehec (William Edmunds) to transmit on his wireless, but the man is caught. Matard is also taken. Though a number of civilians refuse to betray Matard (and are subsequently shot), Plehec's young nephew Etienne (Darryl Hickman) identifies him. When Matard refuses to tell Captain Hans Holz (George Coulouris) the location of the wireless, he is tortured for days. Schoolteacher and Resistance member Jean Kerenor (Richard Whorf) and other villagers manage to free him.
Hidden in a secret room beneath the church, Matard is nursed back to health by Anne Pinot. Knowing his true identity, she admits she loves him, much to his delight. Etienne shows up, telling Matard that his uncle had instructed him to do whatever he had to in order to protect the wireless. The boy takes Matard to it; Matard sends the location to his superiors.
A commando raid is organized, led by Colonel Trane (Reginald Owen). On the way to rendezvous with the British, Matard and Kerenor stumble upon Elise and Holz in each other's arms. Furious that he had defended Elise from the charge of collaboration all this time, Kerenor kills them both. After they depart, Madame Corlay arrives, attracted by the sound of gunfire. When she hears German soldiers approach, she grabs the pistol and allows herself to be captured to shield the others.
Matard joins some of the soldiers in the assault on the control room. Becoming trapped inside, they are rescued by Kerenor, who attacks the Germans from behind. Though he is killed, the others succeed in blowing up the sub pens. The commandos re-embark on their boats. Aboard, Matard finds Anne and Etienne.
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