"The Mysteries of Paris, illustrated with etchings, Vol. 6" by Eugène Sue is a novel published serially between 1842 and 1843. This groundbreaking feuilleton follows the mysterious Rodolphe, actually the Grand Duke of Gerolstein in disguise, as he navigates all levels of Parisian society to restore social justice. From rescuing prostitutes to reforming criminals, Rodolphe compassionately aids the city's downtrodden while exposing the harsh realities of class divide in 19th-century Paris. This instant bestseller pioneered the "city mysteries" genre and sparked socialist discourse before the Revolutions of 1848. (This is an automatically generated summary.)