This is the best book in the entire series. It explains nearly every question I've ever been confused about throughout the books. I'm really pleased that Cruz put this book out, BUT unfortunately it doesn't make up for her lack of detail in the other novels. She even used it to clear up inconsistencies in spellings of names and other plot points from the first book.
I don't understand why, if she has all of these details put together in her head, she doesn't explain them clearly enough in the actual novels. I wish I could put better into words what I mean, but it just bothers me even more now that the books aren't really well written.

I'll keep reading the series though.