"When the NSA's invincible code-breaking machine encounters a mysterious code it cannot break, the agency calls its head cryptographer, Susan Fletcher, a birlliant and beautiful mathematician. What she uncovers sends shock waves through the corridors or power. The NSa is being held hostage... not by guns or bombs, but by a code so ingenioulsy complex that if released it would cripple U.S. intelligence. Caught in an accelerating tempest of secrecy and lies, Susan Fletcher batttles to save the agency she believes in. Betrayed on all sides, she finds herself fighting not only for her country but also for her life, and in the end, for the life of the man she loves."

An earlier story written by Dan Brown (Da Vinci Code) is a little long winded and doesn't have the quicker flow of his best seller. Yet it is still an engaging story and satisfying read.