During the Second World War, midshipman Dourdan, nicknamed 'Saucisse', distinguished himself by his clumsiness and his blunders. Charged with Lieutenant Goldfinch to convey an aircraft to Marrakech, he shot down an American bomber on the way, mistaken for a German plane.
A railway worker, Leguignon, and his wife are forced to move into a house located in a shaggy part of town. What Leguignon doesn't know is that a group of children have discovered a treasure and keeps it stored in the house. Trouble ensues when he discovers the cache and tries to claim it as his own.
Everyone in Paris thinks Fantomas is dead. A wave of extortion, blackmail and murder all point to the master criminal. Inspector Juve and his reporter friend Fandor set out to find the truth.
