A typical Puzo mafia story. The book sells because of its strong chartacters (the Don, Dante, Pippi De Lena, etc.). And my word, what characters they are!
Puzo's incredible characterisation is once again at the forefront of his books. He makes his characters come to life in a way unmatched by any other author.
The story, in contrast to all the complexities of the players involved, is exceedingly simple. But that is usually the case where Puzo is concerned. It is a testament to his ability to grip his readers that he does it with an uncomplicated plot line and relatively easy to predict plot twists.