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Russian grand master dies mysteriously during an international chess match. The case is related to a political intrigue involving the so-called Peace Party and its leaders Madame Olivier and Abe Ryland. Poirot investigates with his old friends Hastings, Japp and lemon, helped by a reporter and a minor actress, but the quartet must soon fight a dangerous battle with the Big Four, a secret society manipulating for their own personal chess game a great number of international celebrities.

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