In a little town in the south-west of France during the
German occupation, Édouard Martin handles the insurance needs of his fellow citizens and also, unknown to his family, is the local head of the
Resistance. An officer in the
First World War, he runs his network on disciplined lines, following orders from headquarters in London, who supply radios and arms by air. When a stranger named Jourdan is parachuted in and wants to mount dangerous attacks, he deduces that the man is an imposter and has him shot. Called in for questioning and asked if he knows Jourdan, he says the man is a
Gaullist bastard. “Oh”, says the German officer, “He' s one of our agents, but seems to have gone missing.” When it becomes apparent that the Germans are using a factory near his house to build mini-submarines, he asks for the
Royal Air Force to destroy it. Since a raid might damage his own house and those of his neighbours, he asks them all to a dinner party in a restaurant. The pretext is the engagement of one of Édouard's deputies, Pelletier, who is in love with his daughter Monique.
Lancaster bombers flatten the factory and the Germans, deducing that Édouard must have known in advance, arrest him. Damaged but alive, he is rescued by his network and, when the Germans retreat in 1944, reunited with his proud family. ==Cast==