A prestigious golf club is the setting for murder when a player is bludgeoned to death on the 13th hole. Barnaby and Jones discover gambling, illegal money-lending, and assault are rife among the snobbish members, who are also dismissive of the local villagers and only allow them on the course for a few hours a week. Before long, another body turns up, making the detectives doubly determined to catch this terror of the fairways.