The Call of Earth continues the story of Nafai, his family, and the few other people selected by the Oversoul to leave the city of Basilica, and their former lives.
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 characterised 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. The Oversoul must have human help to make that journey.