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 (2009 film) it out further. Some sequences in the movie were more than suggested by uncredited incidents found in a 1979 novel "Enter the Lion: A Posthumous Memoir of Mycroft Holmes". Lord Blackwood's character was developed as a nod to Victorian interests in spiritualism and the later influence of Aleister Crowley. The producer felt he was "almost clever" pitting Holmes, who has an almost supernatural ability to solve crimes, against a supposedly supernatural villain. The plot point, moreover, nods to the Holmesian tale of "The Hound of the Baskervilles", where a string of seemingly supernatural events is finally explained through intuitive reasoning