Card, Orson Scott. Homecoming: Harmony. New York: Tor Books The storys about a new world that they named Harmony expressing their greatest hope. As refugees from a devastated Earth, they new humanity would never survive another global war. Convinced that the only way to prevent such terror was to see that their descendants knew and used science, but never developed the transportation systems and high-tech weaponry that would let them destroy themselves, they built a master computer to be guardian of the human race.
The computer could send messages directly into their minds, and it could block out dangerous thoughts that came into their minds. All of the humans on the new planet worshipped the voice inside themselves which they called the oversoul. After 40 million years the oversoul, master computer, it started to break down and was loosing control to talk to the people and to control angry thoughts. It need human help to go back to Earth and help it by fixing the one on Earth. So now the story begins.