I've had a lot of recommendations for this book said to me and if I have to be honest, I am disappointed, for far too many reasons to list.
The main character is fluctuating, her personality inconsistent between each part. She goes from hating Sam to enjoying his presence with no forewarning and in the third part, she's spoiled and jealous about Sam for very little reason. I couldn't even finish the prequel before I had to take a break and didn't pick it back up again.
Maybe the main series is better. I hope so. The prequel, at least, has thoroughly let my expectations down, and I know a few people who wholeheartedly agree with me.