This is a top favorite for mine of the series as a whole. It picks up the thread started in Iron Kissed when Mercy borrowed the book from Phin. 
 I really felt that this book tied up a lot of the threads started in the series from the beginning almost leaving us with a fresh slate for the next installment. 
 We get the continued story of how Mercy is fitting in with the Pack andunresolved Pack issues are dealt with. I don't want to give too much away because there are a lot of revelations in this story. Even with all the revelations, however, the story pacing is still very clear and doesn't feel overwhelmed. All the varying storylines really lend to one another to create a nice whole. 
 Mercy and Adam's relationship really grows in this book. Ive never felt that their relationship was anythingbut solid, but I did feel like there were obstacles they would have to overcome. Nothing just comes easy, and they do overcome everything together and by the end they are a strong solid. 
 Samuel's problems hinted at since the beginning of the series finally come to fruition in this book. It's something that has been brewing since the first book and I'm glad the issue was finally addressed instead of left. 
 As saod previously this book really ties up a lot of loose ends giving the next novel a fresh start. There are a few instances where new storylines could be picked up (just by actions, or things said), but nothing I see as concrete enough that if left alone would detract from the series as a whole. 
 I look forward to continued forays into Mercy's world.