Seville, Spain: the creator of the code, Ensei Tankado, is found dead. And with him has died the secret to an 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 to the towering cathedrals of Spain, a desperate race unfolds. Caught in an accelerating tempest of secrecy and lies, betrayed 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...