Well, they talk a lot about Lucy Mancini, Johnny Fontane, Nino Valenti, a scene where Sonny robs a bank and his father explodes,Luca Brasi and his child, and much more. I don't think a new writer should write the Godfather 4 book but I think everything that wasn't included from the Godfather one-three should be included in four because it is a way to ensure that Mario Puzo's excellence lives on. If you know what I mean, holla