Edinburgh and London: William Blackwood and Sons, 1915. First UK Edition, and correct first. Bound in recent polished blue calf, with gilt titles and rule, marbled endpapers, and original front board and backstrip cloth bound in at the rear. Fine condition. One of the cornerstone espionage novels of the twentieth century, immortalized on film by Alfred Hitchcock in 1935, and basis for a recent (and very successful) Broadway play.