I have to give this novel 5-stars because the author did such a good job of presenting complicated timelines and scenes in a way that was easy for me to keep up and understand what was going on. I loved the concept of the books, (not just the Book of Doors), and the characters were well-developed and I felt empathy and feeling for them, even the villains. Overall great fantasy book, well written, and I could see this someday being a kick-ass movie!