16 - Corsican Brothers by Alexandre Dumas

In Corsican Brothers, Alexandre Dumas masterfully tells the gripping tale of Siamese twins who, though separated in body, remain inseparable in spirit. When tragedy strikes and one brother is murdered, the surviving sibling sets out from Corsica to Paris on a quest for vengeance. Dumas vividly captures the essence of Italy and France while powerfully exploring the profound bond of brotherly love that defies all odds. - Summary by Wikipedia