A murder on a coastal golf links draws the narrator and his friend Hercule Poirot into a complex investigation. A wealthy man's body, enigmatic letters, inconsistent alibis, and a second related death reveal tangled relationships, deception, and concealed identities. Methodical interviews, forensic observation, and a revealing photograph link the crime to an earlier case, and careful reasoning uncovers motives rooted in jealousy and betrayal. Poirot's meticulous reconstruction of small clues produces an unexpected dénouement that resolves the criminal mystery and untangles the narrator's personal entanglements.