London: Herbert Jenkins Limited, No Date . Second Printing. Hardcover. Reprint, the second printing. Octavo, original orange cloth titled & ruled in black on front panel, titled in black with publisher's device on spine, publisher's device on rear panel.  +  pp ads at rear. Small erasure from front paste-down, otherwise a near-fine copy. Near Fine. Item #309513
¶ Thriller. Matheson has invented an explosive of undreamed-of power and deposited the formula at the War Office. He is then kidnapped.