From rear cover: "It's a peaceful and prosperous world in AD 2345, and Robert Clayborn-a designer of bestselling human genetic types-is on top of it. For generations, everyone who matters has come from one of the Big Seven human creches. Life is comfortable and convenient, helped along by the Martian pet rocks, sentient telepathic pebbles which serve their owners as instantaneous communicators and companions. Then, out of nowhere, people born of Robert's genetic designs begin to turn into apes. Including his very own son. His wife leaves him, taking their daughter and their bank accounts with her. His business collapses, as thousands of legalists sue him for their clients' regression into ape-hood. The Oneness, the supreme Martian mind, ordains that Robert will be the Abraham Lincoln who will free the pet-rock slaves. And Robert's own anima somehow gets placed into the body of the notorious Mariata Divine!"