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When the National Security Agency's invincible code-breaking machine encounters a mysterious code it cannot break, the agency calls in its head cryptographer, Susan Fletcher, a mathematician. Caught in an accelerating tempest of secrecy and lies, Fletcher battles to save the agency she believes in.
Dimensions : 11 x 3.2 x 17.8 cm
Format : Paperback
Age Group : ADULT
Page Numbers : 512
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