Over the Atlantic, an airliner's controls suddenly stop reacting. In Japan, an oil tanker runs aground when its navigational system fails. And in the Midwest, a nuclear power plant nearly becomes the next Chernobyl. At first, these computer failures seem unrelated. But Jeff Aiken, a former government analyst who saw the mistakes made before 9/11, fears that there may be a more serious attack coming. And he soon realizes that there isn't much time if he hopes to stop an international disaster.