As with a lot of book 2s in a trilogy, I had a harder time liking this one.  It was so very long and was a bit confusing. 

Joan changed her timeline after learning the truth of who she is. It came at a cost...she changed Nick and Aaron too. 

Now it's up to them to figure a way out of the mess made because there are dark, hidden threats that want to make the monster in control of the world. 

It was interesting to see who remembers who and who remembers what though that's where it's a little harder to follow.