Now, before we get into the essentials of how you can watch 'Le Mystérieux Monsieur Sylvain' right now, here are some important things to know about the ParisFilm Production thriller flick. Le Mystérieux Monsieur Sylvain starring Frank Villard, Simone Renant, Jean Chevrier, Jean Marchat has a Not Rated rating, a runtime of about 1 hr 35 min.
Need a fast recap before watching? Here's the plot: "In an aeronaval 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 Couldnt she be the murderous spy"
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