Golan Trevize, consejero de la Primera Fundación, se pregunta sobre la posibilidad de la supervivencia de la Segunda Fundación. Esta debería haber sido destruida, según la versión oficial, agotándose así los superpoderes mentales de los científicos que la componían y que dirigían en la sombra los aconteceres del Imperio Galáctico.

Tras una serie de intrigas políticas, Trevize se verá obligado a exiliarse en una astronave, en compañía del historiador Janov Pelorat. Pero, una vez en el espacio, ambos decidirán dedicarse a la búsqueda del antiguo planeta Tierra...

ENGLISH DESCRIPTION

The fourth novel in Isaac Asimov's classic science-fiction masterpiece, the Foundation series

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 of 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.