I'm on Chapter 11 of the book version "The Last Don" and I must say, I thoroughly enjoy this book!
Its kinda weird when you read a book before seeing its film adaptation because you already have an idea what it will look like. Once I'm finished with the book, which shouldn't be long, I'm going to order the Last Don 1&2 and see how it fairs with the book. Cross De Lena is the man!