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?
Cast
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
Unknown
Suzanne Bara
Unknown
Roger Bontemps
Unknown
Max Doria
Unknown
Jacques Mattler
Unknown
Jacques Muller
Unknown
Roger Coirault
Unknown
Maud Lamy
Unknown
Philippe Dumat
Inspector