The discretion and high sense of professional honour which have always distinguished my friend are still at work in the choice of these memoirs, and no confidence will be abused. I deprecate, however, in the strongest way the attempts which have been made lately to get and to destroy these papers. The source of these outrages is known, and if they are repeated I have Mr Holmes's authority for saying that the whole story concerning the politician, the lighthouse and the trained cormorant will be given to the public. There is at least one reader who will understand.
Sir Arthur Conan Doyle, 'The Adventure of the Veiled Lodger', The Case-Book of Sherlock Holmes, 1927