The Stepanerks, those strange aliens who sometimes mingle with Humans, have contacted another, as yet undiscovered, alien species that has been guarding Altair for centuries. Those guardians want to forcefully evict Humans, who are doing terrible damage to the ecosystem. But Paul, unwitting 'guest' at their meeting, defended Humanity's right to a second chance. It now falls to him to convince the Human colonial authorities to change everyone's behaviour...