Protagonist Jack Holloway lives a solitary life in a wilderness of planet Zarathustra, itself "owned" by the Chartered Zarathustra Company (under Victor Grego), which installed basic services and colonial outposts initially, and now reaps the benefits of new discoveries, such as the valuable "sunstones" mined by Holloway until he befriends a tiny, golden-furred humanoid that he names "Little Fuzzy". Little Fuzzy brings his family/tribe to meet Holloway and the lot of them promptly adopt Holloway as well. Upon discovery that the Fuzzies' intelligence may qualify them as a sapient species, the Company moves against them. The reason for such an action, which if carried through to conclusion would be genocide, is that such a discovery would turn the planet a protected aboriginal zone, install a proper government there, and deprive the Chartered Zarathustra Company of its complete control of the resources there. Leonard Kellogg, one of Grego's staff, kills a Fuzzy and provokes a court case to decide whether the Fuzzies are sapient. In the midst of the proceedings, the Terran Navy commander reveals that his people have been studying Fuzzies, and prove that Fuzzies have at least the mental capacity of a ten-year-old human child. They also show that the "yeek" noises made by the Fuzzies are merely the human-audible edge of the Fuzzies' voices and that their normal speaking range is in the ultrasonic; and tell the court that they have developed an elementary Fuzzy grammar and dictionary. As a result, the charter of the Chartered Zarathustra Company is invalidated, and Kellogg commits suicide in his cell. Chief Justice Frederic Pendarvis officially rules that the Fuzzies are sapient beings, and Holloway is reunited with his Fuzzy family.