"The Valley of Horses" is a novel by Jean M. Auel, part of the Earth's Children series. It follows the journey of a young woman named Ayla, who is a member of the Cro-Magnon people. Set during the prehistoric era, the story explores her survival skills and her connection with nature as she navigates life alone in a valley. In the valley, Ayla encounters various challenges, including finding food and shelter. She also discovers the presence of Neanderthals, another group of early humans. The novel delves into themes of isolation, resilience, and the development of human relationships in a prehistoric context.