Grisly strangulations in London alert Nayland Smith of Scotland Yard to the possibility of the fiendish Fu Manchu may not be dead after all, even though Smith witnessed his execution. A ... 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.