Doomsday — John Peel

At the threshold of the next century, Tristan Connor lives in a completely computerized America, a mix of virtual and actual realities. Tristian's clone, a dark-minded genius named Devon, has programmed a computer virus that is about to blow the entire system apart. With the electronic clock ticking down to doomsday, Tristan must find his evil clone before it's too late- for everyone.