Date of publication: October 2009
Publisher: Arrow Books
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March 1943. The war hangs in the balance, and at Bletchley Park 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 be a spy inside Bletchley, Jericho's girlfriend, the beautiful and mysterious Claire Romilly suddenly disappears.