Antoine, an accountant by trade, becomes a private detective to support his family. His wanderings lead him to transport a cargo of malachite to Le Havre, in the hope of a large bonus. With the help of his family, and despite a few mishaps, Antoine achieves his goal.
| Writing | Robert Lamoureux | Writer |
| Production | Jacques Marin | Producer |
| Directing | Robert Lamoureux | Director |
| Camera | Marcel Grignon | Director of Photography |
| Sound | Max Olivier | Sound Director |