This is a great story. I wasn't sure what I would think. I wasn't a fan of Cain going into this book. I liked the premise, he is "the Cain", as in his brother Abel, who we met in book two as Luc. Cain is the very first succubus and their leader. In book two we also met Tamara as the best friend of the heroine Anna. All we know about Tamara is that she is a witch. In this book, we learn that Tamara is much more than your standard witch.
Tamara is a "cycler". She and her coven of witches performed a ritual to become immortal. When their current life ends, they are "reborn" into a twelve-year-old body with all their memories intact. They only way for her to truly die is to be killed by another cycler or a really old magic user. When her old coven leader and former lover has gone power hungry and is killing all the other cyclers and coming after her. She goes to Cain hoping that he can drain her completely so that she can die permanently this time.
Cain has been charged by the other of the other preternaturals to keep Tamara safe, because if Jack finds her and absorbs her power, he could be unstoppable.
I really liked the aspect of the conflict between Jack and the rest. I also liked the aspect of how everyone works together. We get to go back to spend time with many of the previous characters. Really on Z and Fiona are missing. I really wish we had gotten more on this and less on Tamara and Cain. I just think the conflict was such a great story, I was sad when we went back to the relationship building.
Overall, I'm really enjoying this series. The sex is very understated compared to most PNR series. The sex scenes are not done in great detail. However, the characters are great and I enjoy the world that is built around them. If you haven't tried this series yet, I highly recommend giving it a try. I can't wait to see where the author takes us on the next book.