When the National Security Agency’s invincible code-breaking machine encounters a mysterious code it cannot break, the agency calls cryptographer Susan Fletcher, a brilliant, beautiful mathematician in its head. What she 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 complex that, if released, would cripple U.S. intelligence.
Caught in an accelerating tempest of secrecy and lies, Fletcher battles to save the agency she believes in. Betrayed on all sides, she finds herself fighting for her country, her life, and in the end, for the life of the man she loves…
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