I just got a book by an author named Tom Santopietro. The Godfather Effect may have been discussed on here in the past, although I could not find it using the search function in any previous posts. Very good book, it analyzes the movie and script, and it goes into the decision making process of how they decided to cut out certain parts of the book to improve the script for the film. Santopietro also gives us information on the history of Sicily and how it fits into the film. It's not the usual read on the Godfather, but a book that anyone on here should read.