本片根據意大利真實事件改編而成。上世紀80年代初期，黑幫首腦多瑪索·布西達從意大利移居巴西，然而遠在意大利的自己的哥哥與孩子卻相繼被黑幫團伙殺害。為了懲治兇手，他開始與意大利警方合作，在兩方的不斷努力下，多瑪索·布西達不僅抓住了殺害自己親人的幕後黑手，並將意大利盤根錯節的黑幫團伙連根拔起……

The story of how Sicilian Mafia boss Tommaso Buscetta (1928-2000), the Godfather of Two Worlds, revealed, starting in 1984, the deepest secrets of the organization, thus helping to convict the hundreds of mafiosi who were tried in the trial held in Palermo between 1986 and 1987.

Italy, early '90s. Calm, clever and inscrutable, politician Giulio Andreotti has been synonymous with power for decades. He has survived everything: electoral battles, terrorist massacres, loss of friends, slanderous accusations; but now certain repentant mobsters implicate him in the crimes of Cosa Nostra.

Palermo, Sicily, 1984. Examining magistrate Giovanni Falcone allies with Tomasso Buscetta, a former mobster, to defeat the clan of Corleone, the ruthless Mafia faction that rules Cosa Nostra with an iron hand, cruelly eliminating all those who dare to oppose its immense power: other criminals, policemen, judges, even innocent civilians. One of them wants revenge, the other wants justice. But only one can survive such an unequal fight.