Robert Hossein, Marina Vlady, Robert Le Beal. A brilliant "little" spy film. Hossein and Vlady play mysterious characters who meet up one night in a lonely cabin in the wilds of Normandy. They are both spies, but whom do they work for-the Allies or the Nazis.

During the Great War, in Austria, an officer was shot on the orders of his superior von Pennwitz. Out of revenge, his widow becomes a spy in the pay of France, preoccupied with removing the person responsible for her husband's death. In charge of a mission to von Pennwitz, she suddenly finds herself face to face with her husband, who is still alive. It was a ruse of war to deceive the enemy. It is only at the armistice that the couple will be able to live in peace.