Digital Fortress: A Thriller Novel by Dan Brown - Cybersecurity Espionage & Codebreaking Adventure - Perfect for Tech Thriller Fans & Book Clubs" （如果原商品是书籍类） 或 "Digital Fortress Security Software - Advanced Cybersecurity Protection for Home & Business - Safeguard Against Hackers & Online Threats" （如果原商品是软件/科技类） 注：根据商品实际类别选择适合的版本，已包含SEO关键词（thriller/cybersecurity/tech等）、英文翻译及使用场景。

A masterful thriller by the author of the #1 New York Times bestseller The Da Vinci CodeWhen the NSA’s invincible code-breaking machine encounters a mysterious code it cannot break, the agency calls 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.