The Traitor tells the true story of Tommaso Buscetta, the man who brought down the Cosa Nostra. In the early 1980s, an all-out war rages between Sicilian mafia bosses over the heroin trade. Buscetta, a made man, flees to hide out in Brazil. Back home, scores are being settled and Buscetta watches from afar as his sons and brother are killed in Palermo, knowing he may be next. Arrested and extradited to Italy by the Brazilian police, Buscetta makes a decision that will change everything for the Mafia: he decides to meet with Judge Giovanni Falcone and betray the eternal vow he made to the Cosa Nostra.