"Le Bossu: Aventures de Cape et d'Épée. Volume 2" by Paul Féval is a swashbuckling novel published in 1857. When the noble Duke of Nevers is treacherously murdered by his power-hungry cousin Philippe de Gonzague, the skilled swordsman Henri de Lagardère vows revenge and rescues Nevers' infant daughter. Eighteen years later, disguised as a hunchback, Lagardère returns to confront Gonzague, who now controls the dead duke's fortune and household, setting the stage for a dramatic reckoning in the shadows of Regency France.
Wikipedia page about this book: en.wikipedia.org/wiki/Le_Bossu_(novel)) Wikipedia page about this book: fr.wikipedia.org/wiki/Le_Bossu