Digital Fortress - Dan Brown

When the National Security Agency’s invincible code-breaking machine encounters a mysterious code it cannot break, the ragency calls in its head cryptographer, Susan Fletcher, a brilliant, beauciful mathematician. What she uncovers sends shock waves through the corridors or power. The NSA is being held hostage – hot by guns or bombs, but by a code so complex that if relcased 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 not only for her country but for her oP life, and in the end, for the life of the man she loves.