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HarperCollins London 1998. Hard cover dust wrapper 614pp b&w plates. Spine slack, some marking on page edges, former owner's address label on top fly, light acid tape staining on eps else very good. Marks tells of his experiences with SOE as a cryptographer. He tells of how he revolutionised the code-making techniques of the Allies, trained some of the most famous agents dropped into France (including the White Rabbit and Violette Szarbo), and reveals the disatrous dimensions of the code war between SOE and the Germans in Holland, as well as how and why he broke de Gaulle's secret code.