I've read it and gave my opinion about in an older topic, can't remember which one.

It was interesting to see that someone other than Puzo or FFC had ideas about a new story of The Godfather. I very much like Riesner's idea of the Corleones being involved with the CIA to kill a dictator as that also happened in real life. But I didn't like Riesner's writing style and his development of the story.