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.

Genres

Cast

René Alexandre

Préval

Maxime Desjardins

Claude Amory

Gaston Dupray

Gaston de Ravennes

Alice Field

Lucie Stenay

Danielle Darrieux

Henriette Stenay

Marcel Vibert

Dr. Carelli