Earthfall (1995) is the fourth book of the Homecoming Saga by Orson Scott Card. The Homecoming saga is a fictionalization of the first few hundred years recorded in the Book of Mormon.
The children of Wetchik are ready to board the starship Basilica and embark on their journey from the planet Harmony back to the origin of humanity: Earth. However, the rivalry between Nafai and Elemak promises the journey will be anything but peaceful. Each faction already has hidden plans to prematurely awaken from the long hibernation, to have the upper hand when the landing occurs. The children become pawns in their parents' power struggle - valuable potential adults that can strengthen each faction. But the Oversoul is ultimately in control, having uploaded a copy of itself into Basilica's central computer, so that it can monitor the ship at all times.
After landing on Earth, the fragile peace wrought onboard is merely a mask for the turmoils of passions that boil beneath. Not only do the colonists have to deal with the split, there are also the mysteriously symbiotic alien races that have evolved on Earth since humanity's departure. The quest to understand the Angels (giant bats) and the Diggers (giant rats) that were foreshadowed in the dreams is not an easy one.