The Adventure of the Greek Interpreter Sherlock Holmes, far from being a one-off in terms of his powers of observation and deductive reasoning, in fact has an elder brother whose skills, or so Holmes claims, outstrip even his own. As a consequence of this, Watson becomes acquainted with the Diogenes Club and his friend's brother, Mycroft. Mycroft, as Watson learns, does not have the energy of his younger brother and as a consequence is incapable of using his great skills for detective work: In spite of his inertia, the elder Holmes has often delivered the correct answer to a problem that Sherlock has brought to him.
Sherlock Holmes pastiches in the list of characters, but named in the text. Several characters from the canon appear in Alan Moore's comic book series "The League of Extraordinary Gentlemen", in which various characters from Victorian fiction are recruited to serve the interests of an alternate-history British Empire. Holmes himself appears only in a flashback during the first series, as he is still presumed dead. Mycroft has a more substantial role in the second series. References in the series suggest Sherlock was a member of an earlier iteration of the League. Moriarty also figures into the first series and the film adaptation. Holmes