Le Mystérieux Monsieur Sylvain
In an aero-naval base, a marine engineer who was about to deliver the name of a redoubtable spy is murdered. Shortly afterwards three different men appear on the crime scene, each of them claiming to be Monsieur Sylvain, the expected sleuth. But which of the three investigators is actually Sylvain? And what about this delightful young lady who arouses one of the police inspectors? Couldn't she be the murderous spy?
Storyline
In an aero-naval base, a marine engineer who was about to deliver the name of a redoubtable spy is murdered. Shortly afterwards three different men appear on the crime scene, each of them claiming to be Monsieur Sylvain, the expected sleuth. But which of the three investigators is actually Sylvain? And what about this delightful young lady who arouses one of the police inspectors? Couldn't she be the murderous spy?
Frank Villard
Ancelin
Simone Renant
Françoise Dastier
Jean Chevrier
Chantenay
Jean Marchat
Morgat
Marcelle Praince
The marquise
André Bervil
The killer
Marcel Raine
Commander Dartois
Paul Amiot
The colonel
Claude Nollier
Suzanne Bara
Roger Bontemps
Max Doria
Jacques Mattler
Jacques Muller
Roger Coirault
Maud Lamy
Philippe Dumat
Inspector