It's a great book, and I love the series, Gomorra, though I haven't seen the last 2 seasons. It's on Amazon prime, I think.
Saviano won the praise of many when he released Gomorrah the book, but many have grown critical, that he is exploiting Italy's problems for vast profit. I also read his book The Pirahanas, which was adapted into a series too.
I read Saviano's book a few months ago. It is a brutally honest inside look at the world of international, high level narco trafficking. It is no wonder that Saviano's life is in danger... He is a very knowedgeable and courageous hero in my book.
I have not seen the series but if it is anywhere near what his book reveals, then WOW!