It is set almost exclusively in California (as opposed to Chan's native Hawaii), and tells the story of the former head of Scotland Yard, a detective who is pursuing the long-cold trail of a murderer.
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Inspector Duff, a Scotland Yard detective and friend of Chan's, first introduced in Behind That Curtain, is pursuing a murderer on an around-the-world voyage; so far, there have been murders in London, France, Italy and Japan.