Although I haven't read it yet, I understand that Giuliano's sister also wrote a book. If you look up Chandler's book on Amazon.com, you'll be able to find his sister's book.

From what I understand, The Sicilian is fairly accurate. My family is from that area of Sicily (my great-uncle actually hid Turi on his farm once) and I've asked them about it, especially about what happened in Portella della Ginestra. Puzo did a pretty good job.