Shadows fall across the narrow streets of Palermo, cloaking the dark hand of the Cosa Nostra, the Sicilian Mafia. The Mafia still extort protection money, known as pizzo, from 80% of Sicilian businesses. In this explosive mix of police footage, frank testimony and chilling reconstruction we throw open the shutters on this hidden world, where to confront the Mafia can spell death. Failure to pay pizzo means arson or physical attack. Clothing maker Libero Grassi was the first to stand up to the Mafia and was gunned down outside his flat. He was labelled "a trouble-maker" says his widow, since no businesses then dared admit they paid pizzo. She draws strength from the brave youngsters who in recent years formed the Addiopizzo (Goodbye Pizzo) movement in defiance of the protection racket. When they took on the Mafia, "All hell broke loose." Menacing conversations intercepted by police reveal the true nature of the extortion. The "soft way" where people are "advised" to pay gives way to gruesome threats: "As soon as you step outside, they'll throw acid in your face..." Bar owner Maurizio Consiglio "found glue in the locks and shutters". CCTV footage captures the crime being committed. When he still refused to pay a motorbike was set on fire, again caught on camera. In intercepted conversations the Mafia discuss setting fires: "Nobody will stop us... BOOM!" Rodolfo Guajana's entire factory was burnt down in what looked like a terrorist attack, as punishment for joining ...