Pino Arlacchi’s *Buscetta: la mafia par l’un des siens* examines the Sicilian Mafia through the figure of Tommaso Buscetta, one of the most important pentiti, or state witnesses, in modern Italian criminal history. The book situates Buscetta’s testimony within the wider structures, rituals, and power struggles of Cosa Nostra, showing how his break with the organization helped reshape public and judicial understanding of the Mafia. Combining investigative reporting with historical and sociological analysis, Arlacchi explores how the Mafia operated as a social and political force, how internal conflicts shaped its evolution, and why Buscetta’s collaboration with authorities became a turning point in Italy’s fight against organized crime. Written for readers interested in true crime, modern Italian history, and the sociology of criminal organizations, the work offers a detailed account of betrayal, justice, and the hidden mechanisms of Mafia power.