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A gripping mystery of codebreaking by the author of The Da Vinci Code. National Security Agency Fort Meade, Maryland. When the most powerful intelligence organisation on earth's invincible code-breaking machine encounters a mysterious code it cannot break, it calls for its head cryptographer Susan Fletcher, a brilliant and beautiful mathematician. What Susan uncovers sends shock waves through the corridors of power. The NSA is being held hostage, not by guns or bombs, but by a code so ingeniously complex that if released it would cripple US intelligence. In Seville, Spain, the creator of that code Ensei Tankado is found dead, and with him has died the secret to his impregnable code-writing formula that threatens to obliterate the post-Cold War balance of power forever. From the underground hallways of power to the skyscrapers of Tokyo and the towering cathedrals of Spain, a desperate race unfolds. Caught in an accelerating tempest of secrecy and lies, and betrayal on all sides, Susan Fletcher finds herself fighting not only for her country but for her life, and in the end, for the life of the man she loves. Told at a cracking pace, 510pp, paperback.