Digital Fortress is a techno-thriller novel about the surveillance data of a nation that is being held captive by a former employee of the NSA. And the government’s attempts to retrieve this priceless information. Former NSA employee, Ensei Tankado is apprehensive about the government policies on national surveillance. So he creates a complex new code to contain the information effectively, holding the NSA hostage with his actions. The NSA looks to their head cryptographer to unlock the code that is called the digital fortress, but things get complicated when Ensei dies of a heart attack. The code can be taken by anyone capable of getting their hands on it. It is a race against time as the government, unseen assassins, and an unknown vested party triangulate towards the necessary information needed. Digital Fortress was published by Corgi in 2004 and is available in paperback.