In this exciting mystery with unforeseen plot twists, Hercule Poirot is summoned to France, to investigate a brutal killing on a golf course. The victim is discovered wearing his son's overcoat, and a passionate love letter is found in the pocket. Before Poirot can unravel the mystery, a second murder takes place, identical to the first. Despite facing hostility from a Paris Sûreté rival, Poirot's exceptional memory for past crimes helps him uncover the truth. In the midst of the investigation, Hastings, Poirot's assistant, falls in love, something Agatha Christie had always hoped for.