An elderly spinster has been poisoned in her country home

Everyone blamed Emilys 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 didnt receive the letter until June 28th by which time Emily was already dead