"Murder on the Links" by Agatha Christie. Her 3rd published book, and the 2nd Poirot book, published in 1923. Poirot receives a letter asking for his help from a South American millionaire living in France, but when he arrives he finds he's too late - the man has already been murdered. An ingenious plot, albeit with a ludicrously over-complex solution involving the coincidence of twins and identical copies of the murder weapon, but still a very good read.
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