Tor, New York, 1993, 1^st/1^st.  ISBN 0-312-93037-2.  Hard cover, 304 pages.  Near fine book.  Dust jacket with price intact has second price sticker on flap, light wear at spine ends and upper corner fold; some rubs and light scratches.  Book interior clean and unmarked.  ‘When the human refugees from a ruined Earth founded a colony on the planet Harmony, they determined that this world would not be devastated by the endless cycle of vicious warfare that had characterized human life from the beginning.  They didn’t try to change human nature.  Instead they installed a powerful computer, called the Oversoul, and gave it the task of governing human affairs by subtly influencing human minds.  That was millions of years ago.  Now the Oversoul is growing weak, breaking down.  It must be returned to Earth, to the master computer called the Keeper of Earth, to be repaired.’ (from front flap)