Digital Fortress

When the NSA's top-secret, impenetrable code-breaking machine, TRANSLTR, encounters an unbreakable code created by a "fallen angel" within the agency, the Director of Operations turns to brilliant cryptographer Susan Fletcher and her fiancé, a Literature professor, to help unravel the mystery. What is the nature of the terrifying code that has taken the NSA hostage? And will David Becker succeed in his quest for a mysterious ring? Caught in a dizzying web of secrets and lies, Susan desperately tries to save the agency she believes in, and later, her own life and that of the man she loves. But will this be the answer to universal security? When the moment of truth arrives, "who will guard the guardians"?