Over the Atlantic an airliner's controls suddenly stop reacting. In Japan an oil tanker runs aground when its navigational system fails. & 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. & he soon realizes that there isn't much time if he hopes to stop an international disaster.