This used to be ranked on the bottom of the series for me. But after this second read I think I have to say it's at the top!
The emotions between Bones and Cat are so raw and open in this book. Bones is faced with the possibility that he has a chance to loose Cat and has no way to deal with it but badly. Cat still thinks to take on everything by herself. Both make mistakes, just as everyone does in a relationship that really matters. Bones and Cat fight their way through, break down walls between them and come out stronger in the end.
Here is hoping Bones and Cat have many more adventures that we get to tag along for!