“Computers don’t think, all they can do is calculate. But when does calculation become thinking?” This is the question keypuncher Jack Heyward keeps asking himself when the system he’s using suddenly starts talking back to him. But Jack has another problem; that system is an especially sensitive one, and he’s suspected of a major security breach. And even if he, his new computer friend and his girlfriend can manage to elude the massive manhunt, a new and still more deadly peril awaits him.