En Route is a novel by the French writer Joris-Karl Huysmans and was first published in 1895. It is the second of Huysmans's books to feature the character Durtal, a thinly disguised portrait of the author himself. Durtal had already appeared in Là-bas, investigating Satanism. En Route and the two subsequent two novels, The Cathedral and The Oblate, trace his conversion to Catholicism, an experience which reflects the author's own. As Huysmans explained: "'The plot of the novel is as simple as it could be. I've taken the principal character of Là-Bas, Durtal, had him converted and sent him to a Trappist monastery. In studying his conversion, I've tried to trace the progress of a soul surprised by the gift of grace, and developing in an ecclesiastical atmosphere, to the accompaniment of mystical literature, liturgy, and plainchant, against a background of all that admirable art which the Church has created.'"