...An empire with the highest level of civilization. Its influence and power are spread over tens of millions of star systems in the Galaxy. Nothing predicts its collapse in the foreseeable future... And then one day the psychohistorian Hari Seldon, having created a mathematical model of the Empire, makes calculations that irrefutably prove that in 500 years the Empire will collapse... The Great Collapse will last 30 thousand years and will be accompanied by a period of stagnation and barbarism. However, Seldon creates a Plan according to which the emergence of a new Empire will occur in just 1000 years. To do this, two Foundations must be created at opposite ends of the Galaxy. Foundations are systems of planets with their own population, groups of scientists who must preserve and increase Knowledge. The natural sciences, primarily physics, will concentrate on one Foundation. The Second Foundation would provide the world with psychologists ready to take control of the new Galactic Empire. And if the first Foundation is known to the entire Galaxy, then the second is created in the strictest secrecy...Centuries pass. New kingdoms are born. Star systems are freed from the influence of the Empire. Fights between the troops of the rotten Empire and the Foundation occur with varying success. The influence of the Foundation is gradually growing. And here is the final battle between the dark forces of the Empire and the warriors of the Foundation...

Separated books under one cover [PDF]:Foundation - the first version of the translationFoundation and the Empire - thisSecond Foundation