I will tell you this, the first 3 books I chose to read on the Mafia got me hooked and and I mean, Hook, Line and Sinker. I was a casual fan now I consider myself pretty intelligent on the subject. Anyway, my first 3 reads were:

1. Underboss: Sammy Gravano's account of his life as the Gambino Underboss and then turning Government informant.

2. Gaspipe: Anthony "gaspipe" Casso's tale of basically sasme thing, his rise and fall and into the WP

3. Mob Cops: Louis Eppilito and Steven Carracappa's story of moonlighting as Mafia Hitmen while being NYPD major crime detectives.

I picked these books at random, I knew very little about the Mafia and I was hooked after the first page