Dark red cloth, lettered in gilt. 252 pp., illus. w/ b&w plates. Mild shelf wear, with a few light surface marks to cloth, mild rubbing to corners and spine extremities. Former owner's signature on front flyleaf, with glue residue from book plate (removed) on front pastedown, otherwise unmarked. Text block edges somewhat dulled by age. Firm binding, clean interior; one plate shows slight loss at top corner and a few slight closed fore-edge tears, others fully intact. 1st American edition: heel of spine shows only Hodder & Stoughton imprint, with Doran as well on lower main title, "Copyright, 1913 / by A. Conan Doyle" on copyright page, no additional printings indicated. A respectably preserved copy of the second Professor Challenger story