Holmes and Watson return from Manor House to London by train and discuss the newly discovered crime and the death of a certain Lord Huxley. At home, Holmes receives a letter from his older brother Mycroft, an employee of the Foreign Ministry and a member of the Diogenes Club; In the letter he asks for a meeting. Holmes remarks that the gift of deduction, with which he skillfully reveals crimes, Mycroft is much more powerful than his brother. The meeting with the brother takes place in the club "Diogenes", where conversations are prohibited, but in a special office where you can talk. Mycroft gives a letter to some lady Eva Brackwell, in which she asks to get rid of the machinations of Charles Milverton - London's most vile criminal, blackmailer and extortionist.