Plot
Fearing the theft of an important secret formula, the scientist Claude Amory asks for help from Monsieur Préval, director of the Sûreté. But when Amory is mysteriously poisoned inside his own home, the detective realizes the case is more serious than he had imagined and decides to investigate each of the suspects.
Trailer
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Cast
René Alexandre
Préval
Harry Arbell
Antoine
Maxime Desjardins
Claude Amory
Gaston Dupray
Gaston de Ravennes
Alice Field
Lucie Stenay
Maurice Varny
Richard Stenay
Danielle Darrieux
Henriette Stenay
Marcel Vibert
Dr. Carelli
André Laurent
Raynor
Isabelle Anderson
Marthe
Jean Laurent
Dr. Dernault
