Barbara L. reviewed on 7/9/2008 + 988 more book reviews

When the National Security AGency's invincilbe code breaking machine encounters a mysterious code it cannot break, the agency calls in its head cryptographer, Susan Fletcher, a brilliant, beautiful mathematician. 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.

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