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?

Genres

Cast

Frank Villard

Ancelin

Simone Renant

Françoise Dastier

Jean Chevrier

Chantenay

Jean Marchat

Morgat

Marcelle Praince

The marquise

André Bervil

The killer

Paul Amiot

The colonel

Claude Nollier

Max Doria

Philippe Dumat

Inspector