During their travels, Adair and her companions slowly learn to cope with life on the alien world, which at first seems superficially Earth-like but which is gradually revealed to have a very different ecology, including at least two different native sentient and humanoid species—a short and stout race at the level of development of hunter-gatherers with a propensity towards kleptomania known as "Grendlers" and the much taller and lankier "Terrians", who are capable of telepathic communication, can tear rents and tunnels in the earth through a pseudo-psychic process and whose well-being is somehow linked to that of the planet. The survivors also learn that the Council — a government group that seems to wield most of the power on the space stations — wants to gain control of G889 for resettlement. Through their various experiments, they have learned that they cannot remove the Terrians without killing the planet. This complicates matters, because Devon's son, who has been healed by the Terrians and who had begun to exhibit some of their unique characteristics, has become the key to the Council's plan for the planet.