Before the multi-million, runaway bestseller "The Da Vinci Code," Dan Brown set his razor-sharp research and storytelling skills on the most powerful intelligence organization on earth--the National Security Agency (NSA), an ultra-secret, multibillion-dollar agency many times more powerful than the CIA. When the NSA's invincible code-breaking machine encounters a mysterious code it cannot break, the agency calls its head cryptographer, Susan Fletcher, a brilliant and 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 ingeniously complex that if released it would cripple U.S. intelligence. Caught in an accelerating tempest of secrecy and lies, Susan 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. From the underground hallways of power to the skyscrapers of Tokyo to the towering cathedrals of Spain, a desperate race unfolds. It is a battle for survival--a crucial bid to destroy a creation of inconceivable genius...an impregnable code-writing formula that threatens to obliterate the post-cold war balance of power. Forever.

丹·布朗（Dan Brown）是美国当今最著名的畅销书作家之一。他2003年3月出版的《达·芬奇密码》创造了一个书市奇迹，旋风般地横扫了美国各大畅销书榜，连续数十周高居《纽约时报》畅销书榜首，全球销量已超过800万册。丹·布朗也凭这部小说而大红大紫。《数字城堡》是丹·布朗的长篇悬念惊悚小说处女作，其创作灵感来自于一个真实的事件。丹·布朗还创作了《天使与魔鬼》、《圈套》等小说，可以说本本都很叫座。

译者朱振武，1963年生，英美文学博士，世界文学博士后。也是《达·芬奇密码》和《破解》的主要译者。