Diogenes Club series "Sherlock". The Diogenes Club has appeared, in various forms, in a great many other settings, most of which take as given the Club's connection to the British Secret Service: Diogenes Club The Diogenes Club is a fictional gentleman's club created by Sir Arthur Conan Doyle and featured in several Sherlock Holmes stories, such as "The Greek Interpreter". It seems to have been named after Diogenes the Cynic (although this is never explained in the original stories) and was co-founded by Sherlock's indolent elder brother, Mycroft Holmes. The club is described by Sherlock Holmes in the story "The Adventure of
Sherlock Holmes pastiches Friends Investigate. Mycroft Holmes, Dr John Watson and Professor George Challenger also appear in the same book. Boris Akunin's short story "The Prisoner of the Tower, or A Short But Beautiful Journey of Three Wise Men" in the "Jade Rosary Beads" compilation describes Holmes and Erast Fandorin's race to thwart a devious extortion plan by Arsène Lupin. Author Nancy Springer writes a series of novels of the adventures of Enola Holmes, the much younger teenage sister of Sherlock and Mycroft. Upon their mother's disappearance, Enola discovers that she in fact left of her own volition according to a carefully devised