"Mysteries of Paris — Volume 03" by Eugène Sue is a novel published serially between 1842 and 1843. This installment continues the story of Rodolphe, a mysterious man who is secretly the Grand Duke of Gerolstein but disguises himself as a Parisian worker. Moving through all layers of society, he seeks to restore social justice by helping the downtrodden, including prostitutes and criminals. The novel offers realistic depictions of the poor while critiquing social institutions, making it popular across all classes and founding the influential "city mysteries" genre. (This is an automatically generated summary.)