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.

• Constantin Film
• Hallam Productions
• Christopher Lee
• Nigel Green
• Joachim Fuchsberger
• Karin Dor
• James Robertson Justice
• Howard Marion-Crawford
• Tsai Chin
• Walter Rilla