I'd give this one a 3.5. I missed getting Edward's true POV in the first half of the book. I've become accustomed to really seeing inside both the hero & the heroine's heads, and I felt like that didn't happen as much until closer to the end. I also got a little annoyed with the heroine. She was very stubborn in maintaining her position - that she didn't think Edward could ever love her (based on something he'd done when she was 16). I wanted to yell at her to just let it go and be a grownup!
That said, I do adore Warren's writing, and the interactions of the Byron family. There was a twist at the end with Mallory that I've been waiting for the entire series to happen, and it did in this book. I'll look forward to reading her book.