I'm sure the book will be a moderate to big hit. Not in the Da Vinci Code realm, but it should be on the best-seller list for a few weeks.

As for a sequel, I don't see where you could go after this, unless he's going to pick up the time lapse between part II and III, which could work, but the problem I have with stuff like this is making these events that take place in between movies too important.

I like to think that the movies are cannon and these books are filler or expanded universe stuff, as they say in the Star Wars lingo. If this big plot happened between part II and III in the Corleone universe, I would think that Puzo and Coppola would have included it in the movie.

But then again, I enjoy anything Godfather, so let me have it.