
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.

Benita Hume
Betty Harlow

Richard Cooper
Jim Frobisher

Dennis Neilson-Terry
Inspector Hanaud

Stella Freeman
Ann Upcott

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March 24, 1930
1h 16m
9.0
Leslie S. Hiscott
Cyril Twyford
1

Julius Hagen Productions
N/A

Wilfred Fletcher
Wabersky

Tony De Lungo
Maurice Thevene

Barbara Gott
Mrs. Harlow

Betty de Malero
Francine
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