Fu Manchu (Christopher Lee) is the internationally known criminal mastermind back for another round of evil deeds. The objects of his malevolence are the police chiefs of the world, in particular the head of Scotland Yard. With the help of his equally evil daughter Lin Tang (Tsai Chin), Fu Manchu deals with shadowy figures of the underworld to reach his objectives. The felonious Fu assumes the leadership of all the world's crime syndicates to exact his revenge, striking fear into the hearts of every law-abiding crime fighter.