"Le Bossu: Aventures de Cape et d'Épée. Volume 5" by Paul Féval is a swashbuckling novel originally published as a serial in 1857. When the noble Duke de Nevers is treacherously murdered by his ambitious cousin Philippe de Gonzague, the skilled swordsman Henri de Lagardère swears vengeance and rescues Nevers's infant daughter. Eighteen years later, disguised as a hunchback, Lagardère returns to Paris to expose the assassin and restore the rightful heiress to her inheritance in this tale of revenge, hidden identities, and sword fights.
Wikipedia page about this book: en.wikipedia.org/wiki/Le_Bossu_(novel)) Wikipedia page about this book: fr.wikipedia.org/wiki/Le_Bossu