This picks up right where the novella (On the Prowl) left off. So, if you haven't read it, right that first! I enjoyed seeing more of the Marrok. He is more of a mystery in the Mercy books, more is learned of his back story in this book.
I liked reading about the breakdown of dominant wolves vs submissive. I thought Anna was a very likeable, strong character in her own unique way. Most definitely a winner!