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...
Jean Gabin
as Jacques Miral
René Navarre
as le professeur Bergmann
Janine Ronceray
as Hilda Bergmann
Viviane Elder
as Monique Aubray
Lucien Callamand
as Fortuné Bidon
André Marnay
as Richard
Hélène Terpsé
as la femme X
Alexandre Mihalesco
as Nostradamus
Mathilde Alberti
as Mme Palmarède
France Dhélia
as Fanoche
Gil Roland
as Robert d'Arbel
Jacques Maury
as Willy Keanton
