|The Mysterious Monsieur Sylvain|
|Directed by||Jean Stelli|
|Edited by||Claude Nicole|
|Music by||René Sylviano|
Paris Production de Films
|Distributed by||Consortium du Film|
|16 April 1947|
The Mysterious Monsieur Sylvain (French: Le mystérieux Monsieur Sylvain) is a 1947 French mystery film directed by Jean Stelli and starring Frank Villard, Simone Renant and Jean Chevrier. 
It was shot at the Billancourt Studios in Paris with sets designed by the art director Emile Alex.
When an engineer at a naval base is murdered three different men turn up claiming to be Monsieur Sylvain, a detective assigned to the case.
Simone Renant was a French film actress. She appeared in more than 40 films between 1934 and 1983. She was born in Amiens, France and died in Garches, France.
Jean Chevrier was a French film actor and member of the Comédie-Française. He appeared in 50 films between 1936 and 1972. He was married to actress Marie Bell. At the end of his life, he was known as Jean-Claude Pascal's lover. He was buried alongside his wife at the Monaco Cemetery in Monaco.
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