Bullying snob Alistair Kingslake is killed with a golf iron at the Whiteacres golf club. After another member, Miles Tully, tells Barnaby about illegal gambling among players, another member, who has had an #39;odd phone call#39; is also slain. A figure in a blue tracksuit is seen at both murders. In fact there have been unreported assaults on members over the months. Barnaby discovers that the gambling is rife and the social-climbing steward , Mrs. Fountain, and her two warring sons are lending money to the gamblers and assaulting them if they fail to pay. Indeed Mrs. Fountain#39;s scheming has driven the killer to commit the Dogleg Murders.