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.
Young Sherlock Holmes: Black Ice older brother Mycroft continues to increase. Sherlock's older brother, who works in espionage, invites Sherlock and Amyus to visit him in London, and is quickly framed for murder. In an unprecedented move Mycroft breaks his fixed orbit, and takes a trip to Russia to investigate whether or not events in that country are related to his murder accusation. Amyus, a very tall man, who helps Sherlock investigate Mycroft's murder accusation. Being his tutor he is attempting to hone Sherlock's observational and deductive skills along the way. Rufus Stone is a violinist who becomes involved in the adventure when Mycroft reveals