How accurate is this book? I know it obviously isn't accurate down to the dialogue, but I'm talking about story-wise. The story of Vincenzo Gibaldi, aka Machine Gun Jack McGurn is quite interesting, pretty ironic too, it all started in him taking vengeance for his father who who was accidentally killed in a hairdressers, which led to a long life of crime, eventually ending with his own death. But this doesnt seem to be that elaborated,in other sources, the story of his father's accidental murder. How reliable is this story, and the whole book overall?