I'd highly recommend the 2013 book by Roberto Saviano. He's more-or-less in witness protection now and heavily guarded. He's the guy who published Gomorrah, much to the chagrin of the Naples mafia, which also was adapted into television and film.
Was wondering if anyone is watching it. Done with 2 episodes now and really liking it so far. Capturing the whole chain of operations is making it a bit all over the place but its still very enjoyable so far.