In "Digital Fortress," Dan Brown plunges us into the secretive world of the NSA, where the agency's infallible code-breaking machine encounters an unbreakable code that could spell disaster for US intelligence. When top cryptographer Susan Fletcher is summoned to crack the code, what she discovers sends her on a desperate race against time. From power corridors to foreign lands, Susan must navigate treachery and deceit to thwart a conspiracy that threatens to topple the world's delicate balance of power and endangers the lives of those she holds dear.