Indianapolis: Bobbs-Merrill, 1907. Green decorated cloth stamped in black and gilt, colour pictorial label on front cover. [8], 389, [3] pp + frontispiece with tissue guard and six other plates. Spine lightly rubbed; cracked inner hinges neatly repaired; bit of foxing to rear endpapers and to pages adjacent to the plates; else a VG clean and tight copy. Hubin (94) p. 347. A crime novel involving a cipher and the basis of a 1922 silent film.; Octavo.