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.
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Cast
- René AlexandrePréval
- Harry ArbellAntoine
- Maxime DesjardinsClaude Amory
- Gaston DuprayGaston de Ravennes
- Alice FieldLucie Stenay
- Maurice VarnyRichard Stenay
- Danielle DarrieuxHenriette Stenay
- Marcel VibertDr. Carelli
- André LaurentRaynor
- Isabelle AndersonMarthe
Crew
- Jean KemmDirector
- Brock WilliamsScreenplay
- H. Fowler MearScreenplay
- Agatha ChristieNovel
- Paul CotteretDirector of Photography
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