From the #1 New York Times bestselling author of The Da Vinci Code comes the explosive thriller that started it all.
An ancient secret brotherhood. A devastating new weapon of destruction. An unthinkable target. When world-renowned Harvard...
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...