"Le Bossu: Aventures de Cape et d'Épée. Volume 3" by Paul Féval is a swashbuckling novel originally published as a serial in 1857. When the Duke de Nevers is treacherously murdered by his cousin Philippe de Gonzague, the skilled swordsman Henri de Lagardère vows revenge and escapes with Nevers's infant daughter. Eighteen years later, disguised as a hunchback, Lagardère returns to Paris to confront the now-powerful Gonzague and restore the rightful heiress to her inheritance in this tale of deception, loyalty, and long-awaited justice.
Wikipedia page about this book: en.wikipedia.org/wiki/Le_Bossu_(novel)) Wikipedia page about this book: fr.wikipedia.org/wiki/Le_Bossu