From the back cover of an Ace reprint: "Zarathustra was a Class III uninhabited planet, and the chartered Zarathustra Company owned it lock stock and barrel. They developed it, exploited it and reaped huge profits without any interference from the Colonial Government.
But then, out of nowhere, came Jack Holloway - with a family of Fuzzies and a great deal of evidence that they were more than just cute little animals.
If the Fuzzies were a race of intelligent beings, the Zarathustra would automatically become a Class-IV inhabited planet, and the company's charter and privileges would be over.
The chartered Zarathustra Company wasn't going to allow that to happen."
In addition to its stand-alone volume, this title was published in the follow books. It can be rated independently of any volumes containing it.