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.
Charles Parker (detective) Charles Parker (detective) Sergeant/Inspector/Chief Inspector Charles "Parker Bird" Parker is a fictional police detective who appears in several Lord Peter Wimsey stories by Dorothy L. Sayers, and later becomes Lord Peter's brother-in-law. He is first introduced in "Whose Body?" as a Detective Inspector from Scotland Yard. In the next book, "Clouds of Witness", he is summoned to assist the local police in the North Riding of Yorkshire who are investigating the death of Captain Dennis Cathcart, the fiancé of Peter's sister, Lady Mary Wimsey, apparently at the hands of Wimsey's brother, the Duke of Denver. Parker first sees Lady Mary