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.
Walter C. Mycroft Walter C. Mycroft Walter Charles Mycroft (1890 – 14 June 1959) was a British novelist, screenwriter, film producer and director. In the 1920s he was film critic of the London "Evening Standard", and a founder of the London Film Society, before joining the film industry. In 1928 he became Literary Adviser and Scenario Editor at the newly founded studio British International Pictures at Elstree, sometimes working with his friend Alfred Hitchcock. He was by his own account the principal author of Hitchcock's first BIP film "The Ring" (1927), and credited as the author of the original story on which "Champagne"