Carlo Antonelli is an engineer from Genoa who is mugged. After the police drop their investigation, he decides to take justice into his own hands. The muggers beat him again, but a young robber helps him to take his revenge.
Felice returns to his native Rione Sanità in Naples to look after his dying mother, having lived abroad for the last forty years. Here he discovers that his old friend Oreste has become a notorious crimeboss.
A gang of teenage boys stalk the streets of Naples armed with hand guns and AK-47s to do their mob bosses' bidding – until they decide to be the bosses themselves.
When his daughter is murdered, William Duncan takes the law into his own hands, setting out on a quest for retribution. After killing the street thug responsible for her death, he finds himself in the middle of a war with the thug's brother, father, and their gang, who are equally hell-bent on getting even. What ensues is a tense back-and-forth game of vengeance. By the end, William comes to find that the quest for revenge never has a winner.
Tony, a mob loan collector, is dissatisfied with his station in life. Though he dreams of one day being rich, he is stuck with the dead-end job of beating up borrowers who fall behind in their payments. After meeting up with Napoli, another mob enforcer who's just been fired from his job, the two hatch a plan. Together, they will con mob boss Manzari out of a fortune, after which they can retire and live in luxury. Manzari, however, is not about to let them go so easily.