I wasn't disappointed. If you have read my reviews before, you know that I get frustrated when the two main characters get torn apart over and over again. Jennifer Armentrout doesn't do that. Katy and Daemon were separated at the end of the last book but it wasn't for long and it didn't happen over and over. They got to face the other challenges in the story together. Their relationship is strong and lasting and, even though Daemon got a bit sappy at times, I was glad they had each other for support. They certainly needed it with everything that was happening!
Archer has quite a large role in this story and I really liked his character. I had a hunch from the beginning when he was placed as Katy's guard that he would help her. He didn't let me down. However, in one scene where she is hurt pretty badly, he just lets it happen. I understood why he had to do it, but it still angered me that he didn't jump it to prevent it from happening. When his true identity was revealed, I was glad he was on the right side. Although I love Dee and Dawson and Beth just as much as I did in the earlier books, Archer became one of my favorite characters in the series. I hope we get to see much more of him.
As for the plot, I thought it was creative that the author used area 51 as a major setting. It fit perfectly. Katy found out just what she was capable of and this produced a lot of conflicting emotions for her. She did some things that she will always regret and some she will never regret. Every character made life changing decisions and had to live with the results, good or bad. There were definitely some dark moments in this book. Family came first no matter what the cost.
Introducing the Origin as this entirely different race brings about a lot of new possible paths for the series to take. Plus, without giving anything away, we have a big turn at the end that could change everything. I predict that war is coming but it is impossible to tell yet who will be fighting on which side. Now comes the long wait to the next book but I am just as excited for this one as I was for each of the others in the series. Keep them coming!