For me this book is not really what I expect. After the events in the last book, it's only natural to have a "healing" book for Mercy. This book, for me, is just that. Well, it serves a few more purposes than that, but to me it speaks more as a book where Mercy gets to overcome the fears established with the events in Iron Kissed. 
 This book is dealing, again, mainly with the vampires and the consequences of Mercy's actions from killing Andre in Blood Bound. By the end of the book that whole deal is wrapped up, although there are still tensions between Marsilia and Mercy that I assume we will see in a later book. 
 Here our main villain is "The Master" who is the only supernatural creatur living in Spokane. A scarey vampire. His role kind of is another version of Tim from Iron Kissed. He violates Mercy (by biting her and making her take his blood but leaving her with no memory of it). Essentially he is trying to gain control of Mercy to make her his "sheep". But, unlike with Tim (until she was able to gain enough strength to kill him) she's able to fully defend herself and not completely feel like a victim. 
 We get to see Mercy and Adam in the first stages of their newly official relationship and work through Mercy's fears. She may have trouble being completely expressive of her emotions to Adam, but he's willing to wait for her to get over her fears and she's more than willing to work on getting over her fears. There's no true drama in the relationship which is nice (some authors can't let the drama go), you can really tell that Mercy and Adam love each other and there's no fear of the alternative happening. It will be nice to see how their relationship progresses throughout the remainder of the series because I really feel they are in it for the long haul now. 
 While this is probably my least favorite of the series, it's in no way bad it's just deals more with the aftermath of the last book while tying together a few strings from previous storylines getting us prepared for the next story.