Growing up in an aristocratic family that seems almost to have stepped out of the pages of The Leopard, Leoluca Orlando entered law and politics in the late 1970s as one of the young idealists identified with the Catholic Church who were challenging the Mafia’s control of Sicilian life. At about the same moment, life in Sicily was becoming more perilous. As if the “old” Mafia had not been bad enough, a new and particularly vicious Mafia sect based in the town of...