Beastmark the Spy is a 1941 spy thriller novel by the British writer J. Storer Clouston.Royle p.68The Spectator, Volumes 168-169. F.C. Westley, 1942. p.88 His final published novel, it was one of several notable thrillers he wrote along with The Spy in Black and The Man from the Clouds.Burton p.377 It originally appeared as a serial in Blackwood's Magazine.
References
Bibliography Burton, Alan. Historical Dictionary of British Spy Fiction. Rowman & Littlefield, 2016. Royle, Trevor. Macmillan Companion to Scottish Literature. Macmillan, 1984.