As an asteroid is about to slam into Earth, ex-convict Roscoe Koudoulian along with Captain Letitia Garvey and her starship crew re-upload their consciousnesses into cyberspace. In that digital realm, Roscoe is confronted by someone he left for dead centuries ago, and the astronauts face younger versions of themselves--ghosts in the machine--whose continued existence could destroy the last survivors of the human race.
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