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 brilliant, beautiful mathematician. What she uncovers sends shock waves through the corridors of power.
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Language: English Paperback: 512 pages ISBN-10: 0552159735 ISBN-13: 9780552161251 Genre: Popular Fiction Size: 10.6 cm x 17.2 cm Shipping Weight: 49 grams Condition: Very Good
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