Centuries after the fall of the First Galactic Empire, Mankind’s destiny lies in the hands of Golan Trevize, former Councilman of the First Foundation. Reluctantly, he had chosen the mental unity of Galaxia as the only alternative to a future of unending chaos. But Mankind as massmind is not an idea Trevize is comfortable with. So he sets off instead on a journey in search of humanity’s legendary home—fabled Earth—hoping to find a solution to his dilemma there. Yet Earth has been lost for thousands of years, and no one can say exactly where it is—or if, indeed, it exists at all. More important, Trevize begins to suspect that he might not like the answers he finds. . . .

At last, the costly and bitter war between the two Foundations has come to an end. The scientists of the First Foundation have proved victorious; and now they return to Hari Seldon’s long-established plan to build a new Empire on the ruins of the old. But rumors persist that the Second Foundation is not destroyed after all—and that its still-defiant survivors are preparing their revenge. Now two exiled citizens of the Foundation—a renegade Councilman and a doddering historian—set out in search of the mythical planet Earth . . . and proof that the Second Foundation still exists. Meanwhile, someone—or something—outside both Foundations seems to be orchestrating events to suit its own ominous purpose. Soon representatives of both the First and Second Foundations will find themselves racing toward a mysterious world called Gaia and a final, shocking destiny at the very end of the universe.