Murder on the Links

An urgent cry for help brings Hercule Poirot to France, but he arrives too late to save his client, whose brutally stabbed body now lies face down in a shallow grave on a golf course. But why is the dead man wearing his son's overcoat? And who was the impressioned love letter in the pocket for? Before Poirot can answer these questions, the case is turned upside down by the discovery of a second, identically murdered corpse.