NOT AN EASY WORLD ... A world where all the warm-blooded animals can interbreed and the genes for intelligence spread freely is not an easy world. The wise creatures of Chamal, risen up from the wild, live together like cats and dogs and lions and lambs. Those genes mix and spread rapidly, wise tribes rise up from the wilderness, then scatter their genes and return to the wild. Their wisdom leads them to wild breeding schemes ... which inevitably fail. They recognize their own perversity and know that their failure is their moral fault. They have managed to put together an advanced technological world - and are almost ready to destroy themselves with that technology. Then the ship from Earth arrives on the edge of their solar system. The chamalians, who recognize the perversity of their genealogy, immediately decide that the humans aboard the ship are purebreds - avenging angels come to destroy their unpure world. They build a great warship in orbit to defeat them upon their arrival. But in Suridash, a desert city isolated from the great states of the planet, they recognize that the angelic humans are their only hope to avoid their self-destructive destiny. Zepp is a small green ape who is caught up in the intrigues of his leaders and sent on a mission to sabotage The Killer of Angels and save Chamal - if he can survive.