"Sinatra, The Chairman" - James Kaplan. Sinatra biography, post 1954. (second part to Kaplan's "The Voice", which covers Sinatra's birth to 1953")
This book is bigger than a phone book. I wouldn't recommend trying to read it cover to cover. Definitely a collectible for the die hard fan. If you get it at a library or something, however, it has a great index, and a ton of material on Frank's mob connections.