Science Fiction Story: "Computers don't think, all they can do is calculate. But when does calculation become thinking?" That's is the question keypuncher Jack Heyward keeps asking himself when the system he's using suddenly starts talking back. But Jack has more problems; this 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 elude the massive manhunt, a new and more deadly peril awaits.