On his wedding day, Robert confesses his father-in-law that twenty years ago, he seduced a lady in a sleeping car of a train. His mother-in-law overhears the conversation and convinces Robert that she was that lady and that makes Robert's bride also his daughter. The wedding is in danger of being annulled when the trickery is finally discovered.
| Directing | Christian-Jaque | Director |
| Camera | Harry Stradling Sr. | Director of Photography |
| Writing | Maurice Hennequin | Theatre Play |
| Writing | Georges Mitchell | Theatre Play |
| Writing | Jean-Henri Blanchon | Screenplay |
| Production | Jean-Pierre Frogerais | Producer |
| Sound | Pierre Fontaine | Music |
| Sound | Jacques Météhen | Music |
| Editing | André Versein | Editor |
| Art | Henri Ménessier | Production Design |
| Art | René Renoux | Production Design |
| Art | Henri Ménessier | Art Direction |
| Art | René Renoux | Art Direction |
| Costume & Make-Up | Mouna Katorza | Costume Design |
| Sound | Jacques Vacher | Sound |