When a man is found dead in a freshly dug grave adjacent to a golf course, Hercule Poirot and Captain Hastings arrive on the scene only to be met by a hostile local police detective who is unwilling to share information. But Poirot's methodical investigation slowly and surely reveals the real killer amid a host of suspects and clues, including an impassioned love letter and heavy lead piping found near the body. However, as Poirot and Hastings rush to solve the murder, a similarly slain corpse and fresh clues are discovered.