London: Ward Lock & Co., Limited 1906. Hardcover first edition - The first collaboration between these two authors, a story of espionage and treachery set in 19th century France and Russia. It begins simply and dramatically -"I was condemned to die." Glossy frontispiece by Harold Piffard. Tissue guard. 320 pp plus 4 pp publisher's ads. Rather hard to find - no copies being offered for sale, and Worldcat only locates 4 copies in the UK.