"Foundation and Empire" is the second book in Isaac Asimov's Foundation series. It follows the decline of the Galactic Empire and the efforts of the Foundation to maintain stability in a chaotic universe. The story is divided into two parts, focusing on the challenges posed by both external threats and internal conflicts. The first part deals with the rise of a powerful mutant known as the Mule, who disrupts the Foundation's plans. The second part explores the Foundation's attempts to counter the Mule's influence and restore order. The novel highlights themes of power, prediction, and the cyclical nature of history.