Brainjack by Brian Falkner
The next war starts in cyberspace. A thrilling action novel set in the not-too-distant future in which a brilliant young computer hacker fights to prevent the human race from being erased. It would take a very special person to crack the computer systems of the White House. An expert. A genius. A devil. All of the above, some would say. Someone like Sam Wilson, brilliant teenage computer hacker. But Sam's obsession is about to lead him into a dangerous world. A world of espionage and intrigue; of cybercrime and imminent war. A world where logging on to your computer could mean the difference between life and death.