Heart of Obsidian - Nalini Singh I really loved this story. To get to read Kaleb's story and learn the truth behind what makes him the man he is was a great addition to the series. I have had many mixed, mostly not great, feelings about Kaleb throughout the books, but to learn about all that he went through as a child was a bit heartbreaking. It makes me have to think back on many of the books in the series on the choices he has made throughout and rethink how I feel about them. It's difficult to talk too much without revealing major plot lines for anyone a few books back or more. I love this series and can't wait to read on.