Via Something Weird: "Four men representing the world’s great criminal organizations unite to locate a cache of sunken treasure. The treasure is in fact a fortune in diamonds and secret documents that was lost by the Germans in the seas off Monte Carlo during the war. Following their every move are representatives from every secret agency in the world, amongst them, the British, the Russians, the Germans, and the Americans, all seeking the important papers contained within the treasure."

Venturi was once the king of the Pigalle underworld. Today, he lives in retirement with his wife, in an estate near Chantilly. He still receives the takings from a few hôtels de passe and cabarets, enabling him to subsist without financial worries. But a gang of young hoodlums follows in his footsteps, committing robberies and picking fights in the establishments controlled by Venturi. His faithful companion Cristiani is murdered, as is his wife Germaine. Venturi is determined to take revenge.