1 piece. Autograph Manuscript Signed. Doyle, Arthur Conan. "Mr. Sherlock Holmes to His Friends." [London], Jan., 1927. 3pp, 4to; clean and attractive on rectos of 3 sheets. Working ms. with autograph corrections & additions. Written for Strand Magazine, March 1927 as "A Sherlock Holmes Competition - Mr. Sherlock Holmes to His Readers", pp281-4. Re-edited later that year as the preface to the Case Book of Sherlock Holmes.