"Runaway Horses" is a novel by the Japanese author Yukio Mishima, published in 1969. It is the second book in Mishima's The Sea of Fertility tetralogy, exploring themes of beauty, death, and the conflict between modernity and tradition in post-war Japan. The story follows Isobe, a man obsessed with the memory of his deceased wife, as he seeks meaning and fulfillment in a changing world. The narrative delves into Isobe's emotional turmoil and his interactions with various characters, including Yukio Mishima's reflections on the nature of existence. The novel combines philosophical musings with a rich portrayal of Japanese culture, making it a significant work in modern literature.