Roberto Saviano, author of 'Gomorrah', the definitive book on the Neapolitan mafia, and contributor to previous films and television series, is one of the writers of Claudio Giovennesi's film 'Piranhas'. The film's distinguishing feature it that it focuses not on the godfathers at the top of the organisation, but on the kids who get sucked into the mafia life. It's believable and doesn't glamourise the world at all, but as a movie, it lacks a certain drama, perhaps because of how what goes wrong feels both inevitable and accidental at the same time. I'd still recommend watching it, but the ending underwhelms. Maybe you need a touch of the grand operatic style that characterised 'The Godfather', and indeed the television series of 'Gomorrah', to truly pack that dramatic punch.
Review of Piranhas
