
24/03/1930
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
as Betty Harlow

Richard Cooper
as Jim Frobisher

Dennis Neilson-Terry
as Inspector Hanaud

Stella Freeman
as Ann Upcott

Wilfred Fletcher
as Wabersky

Tony De Lungo
as Maurice Thevene

Barbara Gott
as Mrs. Harlow

Betty de Malero
as Francine
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