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A frightened woman is murdered in the London apartment of a well-known novelist named Henry Leroux. The police arrest Leroux's butler, but he escapes and runs off to a mysterious opium den, the lair of a drug dealer named Mister King. Gaston Max, a detective from Paris, arrives in London to investigate the drug trafficking. Although the police take down the gang, Mr. King escapes and manages to keep his true identity a secret.
Sydney Seaward
Inspector Dunbar
Arthur M. Cullin
Dr. Cumberley
Harvey Braban
Gaston Max
Annie Esmond
Denise Ryland
Norman Page
Soames
Kitty Fielder
Lady of the Poppies
Kiyoshi Takase
Ho-Pin
A.C. Fotheringham-Lysons
Henry Leroux
Mary Massart
Helen Cumberley
Cyril Percival
John Howard Edel
Ivy King
Mrs. Leroux
June Tripp
Mrs. Vernon
Eric Albury
Gianopolis
Geoffrey Benstead
Sowerby
