Théodore Beudraves works at night in a hotel and sleeps during the day. His salary allows him (unbeknownst to his wife Rose) to pay for singing lessons to Gaby Beauchamp, his young friend. But she falls in love with her son, Darius Beudraves, and vice versa.
| Actor | Role |
|---|---|
 Marcel BarenceyThéodore Beudraves | Théodore Beudraves |
| MMylo d'ArcylleRose Beudraves | Rose Beudraves |
| PPaulette DuvernetGaby Beauchamp | Gaby Beauchamp |
 Robert DarthezDarius Beudraves | Darius Beudraves |
 Gaston DuprayCamille Ducreux | Camille Ducreux |
 Paulette DubostThe Little Woman | The Little Woman |
 Anna LefeuvrierSarah | Sarah |
| FFred MarcheIsaac | Isaac |
 Louis FlorencieCommissioner | Commissioner |
 Henri JullienSinging teacher | Singing teacher |
| KKetty PiersonMarie | Marie |
 André NumèsLaplotte | Laplotte |
| RRobert TrèvesPresident | President |