The Murder on the Links by Agatha Christie

It may only be Hercule Poirot’s second outing but the great detective is already fully formed in this marvellously labyrinthine whodunnit set in a French golfing resort. Personal avarice, illicit love affairs and a neighbour who must be too good to be true, The Murder on the Links has them all.    

On a French golf course, a millionaire is found stabbed in the back...

An urgent cry for help brings Poirot to France. But he arrives too late to save his client, whose brutally stabbed body now lies face downwards in a shallow grave on a golf course.

But why is the dead man wearing his son's overcoat? And who was the impassioned 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..