Two friends, Tricoche and Cacolet, are partners in a detective agency. Chance has it that Cacolet is hired by Van der Pouf, a rich banker who wants him to watch over his wife Bernardine while the latter, on her part, seeks the services of Thicoche.
| Actor | Role |
|---|---|
 FernandelTricoche | Tricoche |
 Frédéric DuvallèsCacolet, l'associé de Tricoche | Cacolet, l'associé de Tricoche |
 Ginette LeclercFanny Bombance | Fanny Bombance |
 Elvira PopescuBernardine Van der Pouf | Bernardine Van der Pouf |
 Jean WeberLe duc Émile | Le duc Émile |
 Saturnin FabreMonsieur Van der Pouf | Monsieur Van der Pouf |
 Sylvio De PedrelliOscar Pacha | Oscar Pacha |
| JJean GobetBreloque, le secrétaire | Breloque, le secrétaire |
 Gaston OrbalFil-de-fer | Fil-de-fer |
 Rivers CadetNaphtaline | Naphtaline |
 Alexandre MihalescoLe régisseur | Le régisseur |
| MMonique MonteyGeorgette | Georgette |
| SSimone Chobillon(uncredited) | (uncredited) |
 Manuel Gary(uncredited) | (uncredited) |
 Palmyre LevasseurLa bonne de Tricoche (uncredited) | La bonne de Tricoche (uncredited) |
 Albert MalbertL'acteur (uncredited) | L'acteur (uncredited) |
 Franck Maurice(uncredited) | (uncredited) |
| MMadeleine SuffelVirginie, la bonne du bureau de placement (uncredited) | Virginie, la bonne du bureau de placement (uncredited) |
| FFernand Trignol(uncredited) | (uncredited) |