Against Nature, also known as Against the Grain, is a novel by Joris-Karl Huysmans. It tells the story of Jean des Esseintes, an eccentric aristocrat who retreats from society to indulge in his own decadent and aesthetic pursuits. The book explores themes of artifice, individualism, and the rejection of societal norms. Huysmans' vivid descriptions and introspective narrative make this novel a fascinating exploration of decadence during the fin-de-siècle.