Cat and Bones find themselves up against yet another adversary in this fourth book of the series. Cat finds her dreams being invaded and controlled by a Master vampire named Gregor who claims she is his wife. And, he says he has the proof that their alliance pre-dates that with Bones. There are many deceptions along the way, including some that drive a potentially permanent wedge between Cat and Bones. Again, we are treated to another page turner,with many plot twists and emotional upheavals. There are surprising alliances and irrevocable decisions made in the story that will change the course of Cat and Bones' relationship. This is a tale told masterfully and is gut-wrenching through the end. I literally could not put the book down.Another well-written installment in the Night Huntress series.