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An A format (110x178mm) paperback. In very nice condition. “March 1943, the war hangs in the balance, and at Bletchley Park Tom Jericho, a brilliant young codebreaker, is facing a double nightmare. The Germans have unaccountably changed their U-boat Enigma code, threatening a massive Allied defeat. And as suspicion grows that there may b a spy inside Bletchley. Jericho’s girlfriend, the beautiful and mysterious Claire Romilly, suddenly disappears.” IN STOCK FOR IMMEDIATE DESPATCH