Poirot - Dumb Witness HarperCollins Agatha Christie

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An elderly spinster has been poisoned in her country home...Everyone blamed Emily's accident on a rubber ball left on the stairs by her frisky terrier. But the more she thought about her fall, the more convinced she became that one of her relatives was trying to kill her. On April 17th she wrote her suspicions in a letter to Hercule Poirot. Mysteriously he didn't receive the letter until June 28th...by which time Emily was already dead... "One of Poirot's most brilliant achievements" Glasgow Herald