In the summer of 1917 a convalescing Lt. Hastings runs into his old friend Hercule Poirot at an opportune moment. Hastings is visiting Sir John Cavendish at his family's estate near the village of Styles St. Mary. Cavendish and his siblings are not pleased that their mother, Emily Inglethorp, has re-married and there is ill feeling among several members of the family. Mrs. Inglethorp has recently received information that caused her to change her will, pieces of which Poirot has found burned in her fireplace. When Inspector Japp of Scotland Yard arrests John Cavendish and charges him with murder however, Poirot is convinced that an error has been made.
—garykmcd