
15/07/1932
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.

René Alexandre
as Préval

Harry Arbell
as Antoine

Maxime Desjardins
as Claude Amory

Gaston Dupray
as Gaston de Ravennes

Alice Field
as Lucie Stenay

Maurice Varny
as Richard Stenay

Danielle Darrieux
as Henriette Stenay

Marcel Vibert
as Dr. Carelli

André Laurent
as Raynor

Isabelle Anderson
as Marthe

Jean Laurent
as Dr. Dernault
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