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In Dijon, Inspector Hanaud investigates Betty Harlowe after her uncle, Boris Waberski, accuses her of poisoning her wealthy aunt for an inheritance. While an initial autopsy finds nothing, Hanaud discovers the use of Strophanthus Hispidus—a rare, undetectable poison applied via an antique arrow. Amidst a flurry of "poison pen" letters and deception, Hanaud proves the murder occurred despite the lack of conventional medical evidence.
Directed by Leslie S. Hiscott

Benita Hume
Betty Harlow

Richard Cooper
Jim Frobisher

Dennis Neilson-Terry
Inspector Hanaud

Stella Freeman
Ann Upcott

Wilfred Fletcher
Wabersky

Tony De Lungo
Maurice Thevene

Barbara Gott
Mrs. Harlow

Betty de Malero
Francine
Three Black Eyes
1919