Production Companies: Constantin Film , Hallam Productions , Taurus Film .
Overview: Grisly strangulations in London alert Nayland Smith of Scotland Yard to the possibility that fiendish Fu Manchu may not after all be dead, even though Smith witnessed his execution. A killer spray made from Tibetan berries seems to be involved and clues keep leading back to the Thames.
, Hallam Productions , Taurus Film 
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