On his wedding night with Hilda Bergmann, the daughter of a swedish chemist, the young and rich american Willy Keanton is stabbed by an unidentified masked man. He kidnaps the young woman, who is found later on by the count Robert d'Arbel. The detective Jacques Miral, nicknamed « the pointed tower's ferret » is put in charge of the case. Soon, he discovers that an international bandit, Méphisto, seeks to seize the formula of a process against asphyxiating gas, invented by professor Bergmann. The struggle is tough between Miral and the uncatchable Méphisto. Monique Aubray, Keanton's secretary and engaged to the detective, the Nostradamus stallholders and the « mastiff of Bordeaux », and the famous novelist Fortuné Bidon are also involved in the case...
| Actor | Role |
|---|---|
 Jean GabinJacques Miral | Jacques Miral |
 René Navarrele professeur Bergmann | le professeur Bergmann |
| JJanine RoncerayHilda Bergmann | Hilda Bergmann |
 Viviane ElderMonique Aubray | Monique Aubray |
 Lucien CallamandFortuné Bidon | Fortuné Bidon |
 André MarnayRichard | Richard |
| HHélène Terpséla femme X | la femme X |
 Alexandre MihalescoNostradamus | Nostradamus |
| MMathilde AlbertiMme Palmarède | Mme Palmarède |
 France DhéliaFanoche | Fanoche |
| GGil RolandRobert d'Arbel | Robert d'Arbel |
 Jacques MauryWilly Keanton | Willy Keanton |
| PPaul ClergetCornelius | Cornelius |
| LLouis ZellasLe « Dogue de Bordeaux » | Le « Dogue de Bordeaux » |
 Fernand GodeauÉdouard | Édouard |
| JJean Marié de L'IsleLe juge d'instruction | Le juge d'instruction |
 Milly MathisNot listed | Not listed |
| BBlanche EstivalNot listed | Not listed |