Mussolini's crackdown on organized crime nearly destroyed the Sicilian mafia, and this film traces how that grudge turned into a wartime alliance with American intelligence. Charles "Lucky" Luciano, serving a long sentence in a New York prison, offers his underworld contacts to naval intelligence officers working Operation Underworld, a scheme to protect the docks from sabotage and later to smooth the invasion of Sicily. Historians and archival footage walk through how mafiosi with roots in Sicilian villages fed intelligence to Allied planners, how exiled bosses like Vito Genovese maneuvered between fascist and American patrons, and how the 1943 landings reopened Sicily to the very clans Mussolini had jailed or exiled. The film treats Luciano's eventual deportation and the mob's postwar resurgence as the payoff of the deal, not a footnote. It keeps the focus on documented figures and operations rather than myth, laying out a genuine, uncomfortable partnership between American war planners and organized crime that outlasted the war itself.