British writer, and creator of Sherlock Holmes, the best-known detective in literature and the embodiment of ratiocination, or deductive reasoning. Doyle himself believed in fairies and was very interested in occultism. ANS signed “A. C. D.,” one page, 5.25 x 3.5, personal letterhead, no date. Short note to an unknown recipient. In full, “A very interesting case. Was there any reason why this lady should not rest or should come back?” In very good condition, with heavy vertical fold through middle initial and scattered soiling. R&R COA.