A n urgent appeal for help brings Hercule Poirot with unaccustomed haste to France. Alas, he arrives too late. His client, amysterious millionaire, has been brutally stabbed to death... the corpse flung carelessly into an open grave.Bur Poirot knows that it s the little grey cells that count. And as he starts to unravel the baffling murder, he dircovers that the clue to the killer s identity lies in a crime committed more than twenty years in the past...