Good book! I got a few laughs with the psycho persona that Lefty Ruggiero was. Lots of information so if you aren't into the whole mob-thing, maybe you will find it a bit too match to the point, if you get what I mean. On the other hand, if you though the movie was good, this is for sure better. Shows that Pistone never ever had second thoughts about who he was while being undercover, and Lefty (Al Pacino in the movie) wasn’t the poor mafia-guy they portrayed in the movie.
Recommended if you want to know more about the life of wise guys!