Overview
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?
| Actor | Age then | Age now | |
|---|---|---|---|
 | 30 | September 19, 1980 (63) | |
 | 36 | March 29, 2004 (93) | |
 | 31 | December 13, 1975 (60) | |
 | 44 | October 2, 1966 (64) | |
 | 64 | October 26, 1969 (87) | |
 | 42 | January 1, 1972 (67) | |
 | 48 | August 12, 1956 (58) | |
 | 61 | January 26, 1979 (92) | |
 | 27 | February 12, 2009 (89) | |
| - | - |