After receiving an urgent plea for help from French multimillionaire Paul Renoux, Hercule Poirot and his longtime friend Hastings set out at once. But when they arrive in France, M. Renoux is already lying in a freshly dug grave in the middle of a golf course—with a knife in his back. The police believe Renoux’s wife is involved, since not long before the tragedy Renoux changed his will, and now the woman becomes the heir to a huge fortune. But Hercule Poirot knows that the search for the killer has only just begun…