The local building-contractor Martin Roumagnac is fascinated by the fashionable Blanche Ferrand. To impress Blache, Martin presents her with a villa. However, this ruins him financially. Despite Martin's many efforts for the now femme-fatal Blanche, she is not able to chose between him and the rich consul De Laubry.
You can now watch The Room Upstairs online on the following streaming providers in the United States.
| Writing | Pierre-René Wolf | Novel |
| Directing | Georges Lacombe | Director |
| Camera | Roger Hubert | Director of Photography |
| Editing | Germaine Artus | Editor |
| Writing | Georges Lacombe | Screenplay |
| Writing | Pierre Véry | Screenplay |
