Sherlock Holmes investigates a claim of inheritance, after receiving a letter from a man named Nathan Garrideb, who claims that he has been contacted by another man with the same surname, John Garrideb. John Garrideb has told Nathan that he is looking for two other Garridebs so that they can claim a fortune left to them by a distant relative. Nathan is skeptical, but he asks Holmes for help in finding the other Garridebs...