Sweet Boundless Book

Each book in this series gets better and better. I absurdly love them. I love the fact that each of these characters is flawed in an utterly realistic way. That makes their journey towards healing that much more believable and gripping. The emotions in this book are so real, so perfectly portrayed. It's hard to not get caught up and unable to put the book down.
Once again, I'll say that each book is not a standalone story. While there is a plot arc - gradual build up, climax and denouement - the whole story spreads across all three books. Without one, it's incomplete.
For that reason, I highly recommend the entire series, not just this single book.