무장 강도가 넘쳐나고 마약 밀매가 성행한다. 은드랑게타 마피아가 세력을 넓히던 1980년대. 두려움을 모르는 반항아가 밀라노를 지배하는 어둠의 군주로 거듭난다.

Milan, Italy, 1967. Santo Russo, a boy of Calabrian origin, arrives north with his parents and younger brother to find better living conditions. Due to an absurd misunderstanding and his father's contempt, Santo ends up in prison, where he gets a "true education." In 1978, he and his friends Slim and Mario embark on a 15-year criminal career, a successful and ruthless spiral of robberies, kidnappings, murders and heroin smuggling.