The distant future. Humanity has split into those who live in the Clusters—vast tower-cities—and savages who make their living in the wastelands. Mortal danger hangs over Cluster Djerba. And only Valtor Prey and his Ramon friends know how to thwart the sinister schemes of Kir Dungayev, the “gray cardinal” of the Triangle of Clusters, who has decided to seize control of the Cluster. But trouble never comes alone. Numerous tribes of jangurs, who lead a primitive way of life, are leaving their settled lands. And all because eyeless monsters called aivurs have invaded Bitkhant, where they had previously lived in peace; very soon these monsters become a threat to the entire Triangle…