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A harpoon murder has been committed in Forest Row, Weld. The victim is 50-year-old Peter Carey, a former boatswain of the whaling ship Unicorn Dundee. The young inspector Stanley Hopkins turns to Sherlock Holmes, whom he considered his mentor, for help. Holmes determined that the murderer had extraordinary strength, as he nailed a man to the wall with a harpoon with one blow. This is where the mystery begins to unravel.