With this album, Asimov returned to his great cycle of the Foundation. Winning return for the author as the fourth book is a success story with its incredibly rich intermingle where calculations, various strategies and challenges with admirable gusto. A really great novel that can be read independently of the others but is gaining wealth to be read in the continuity of not only the Foundation cycle but also in the great history of the future imagined by the author with reference to the cycle of robots the novel The End of Eternity.
