Digital Fortress is a story about a cryptographer, Susan Fletcher, who worked for an intelligence agency the National Security Agency. Susan was engaged to a David Becker who was a foreign-language specialist. Torn between managing her relationship and cracking codes, Fletcher’s life is extremely busy. Suddenly, one morning, Commander Trevor Strathmore calls Fletcher, saying that there is an emergency in Crypto. An unbreakable code Digital Fortress has appeared out of nowhere and jeopardises U.S. intelligence. NSA’s most powerful computer, TRANSLTR could not break it. Fletcher finds out that Ensei Tankado was behind Digital Fortress. She also learns that Tankado died but has a partner whom he calls NORTH DAKOTA. Now, Susan Fletcher has to find out the real name of NORTH DAKOTA. She suspects it is NSA employee Greg Hale.

Meanwhile, David Becker is asked by Strathmore to find Tankado’s ring, which is suppose to have the pass-key to Digital Fortress. Every person he meets is mysteriously murdered by an assassin, Hulohot.

Things get worse in Crypto when a system-security officer is murdered violently and the cooling system of the TRANSLTR. Greg Hale holds Strathmore and Fletcher hostage to “escape murder”. However, it fail and Hale gets killed. An explosion of the TRANSLTR kills Strathmore. At this juncture, David Becker has to face Hulohot who plans to murder him. Hulohot was eventually killed.

Susan and David are safe, but not the NSA. Digital Fortress turns out to be a worm that threatens to release information to the world by hacking its way through the firewalls. Fletcher eventually stops it by finding out the correct pass-code.

Dan Brown as a Writer:

Dan Brown is the author of The Da vinci Code, one of the most widely read novels of all time, as well as the international bestsellers Angels & Demons, Deception Point, and Digital Fortress. He now lives in New England with his wife.