This is the first new translation of En Route since C. Kegan Paul's expurgated original of 1895, which censored or completely cut sections dealing with Durtal's sexual obsessions. Restoring these cuts serves to heighten the drama surrounding Durtal's existential crisis, and gives the novel a perspective that has hitherto been lacking for English-speaking readers. En Route was J.-K. Huysmans' first novel after his conversion to Catholicism and effectively opens a trilogy of novels detailing the spiritual journey of his alter-ego protagonist, Durtal.

The novel caused a sensation on its first publication, not just because of the surprisingly frank descriptions of Durtal's obsessive sexual thoughts, but also because Huysmans' was still best known as a disciple of Zola's Naturalist school and few expected this frank and detailed account of a conversion from a writer who only a few years previously had scandalized the Parisian literary world with his Satanic novel of 1891, La-bas.