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. 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. 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 life, and in the end, for the life of the man she loves... "Pure genius...Dan Brown has to be one of the best, smartest, and most accomplished writers in the country" -- Nelson Demille "Fascinating and absorbing - perfect for anyone who appreciates a great, riveting read...Dan Brown is my new must-read" -- Harlan Coben "Dan Brown has built a world that is rich in fascinating detail, and I could not get enough of it. Mr Brown, I am your fan" -- Robert Crais "In this fast-paced, plausible tale, Brown blurs the line between good and evil enough to delight patriots and paranoids alike" Publishers Weekly "Digital Fortress" is the best and most realistic techno-thriller to reach the market in years... A chilling thrill a minute" The Midwest Book Review