"The Second Foundation" is the third book in Isaac Asimov's Foundation series. It follows the story of the Foundation established by Hari Seldon, a mathematician who developed the science of psychohistory to predict the future. The narrative explores the hidden Second Foundation, which is tasked with preserving knowledge and guiding humanity through a period of chaos. The Second Foundation is located at the opposite end of the galaxy from the first Foundation. Its members possess advanced mental abilities, allowing them to influence others and maintain control over the unfolding events. The book delves into themes of power, manipulation, and the struggle between the two Foundations.