A Rebours, meaning 'Against Nature' in English, is a novel by the French writer Joris-Karl Huysmans. Published in 1884, it is considered a seminal work of the decadent movement. The story revolves around the life of Jean des Esseintes, an eccentric aristocrat who retreats from society to pursue a life of aestheticism and indulgence. Huysmans' vivid descriptions and exploration of the darker aspects of human nature make this book a fascinating read for those interested in fin-de-siècle literature.