"Là-bas" by J.-K. Huysmans is a novel published in 1891. It follows Durtal, a writer disgusted with modern life, who seeks refuge in studying the medieval child-murderer Gilles de Rais. His research leads him into the occult underworld of fin de siècle Paris, where he discovers that Satanism thrives in contemporary France. With his lover Madame Chantelouve, Durtal investigates this hidden world, culminating in a notorious Black Mass. The novel stirred immediate controversy and was banned from French railway stations.