Their bond is so complex and I loved getting the dual narrative to see where both were coming from in their decisions and how much they really would sacrifice for the other. I think its well written and the epitome of what sibling relationships should be like. Sure everything is not always peachy but that would also make it unrealistic.
The people that Fia is working under and at first took Annie under their wing is well thought out and is not one dimensional. They all have different motives, and it took me a bit to grasp on at what they are after, and especially how James played into everything and I am sure that even the things that I think I know will be shaken in the next book.
Adam is a great addition as well. I thought he was just an introduction at first, but then I saw all of the threads that he was weaving into the plot and I cannot wait to find out how else he will play into it.
The only thing I have to complain about is the timing of the flashbacks. I understand why they are important and what they add to the story, but at times, especially at first, I felt like it was pulling me out of the action and it took me a bit to get back into it.
Overall though, I loved it and Kiersten has created an intriguing world that I can't wait to find out more about.
Bottom line: Well done paranormal that left me wanting more of the plot, mystery, action, and especially more of Fia.