I gave this sequel 4 stars, again, like the first book, because of the writing, but I still struggled with connecting with and relating to Cassie, the main character. There are a few mentions of this future society being very progressive as far as sexual orientation, and Cassie is noted in the first book to be asexual, but then there are instances of Luka kissing her and Cassie developing some mild feelings for him, though at the end of this book she states that she will never want anything more than kissing from him, so I struggled with understanding that type of attitude. There are also quite a few instances of strong language in this book, where there was pretty much no strong language in the first book.
There were a few times I struggled with the plot as well and where it seemed to be going, and it often felt like things were random and not connected or organized very well, as well as the advanced technology seemingly thrown in because the time frame for the book is supposed to take place in the fairly near future (around 2050), so it was hard for me to follow that at times, the connections between present-day technology and the more advanced technology for this future world. That could have just been my comprehension though, but it still felt to me as though the technology was advanced but then it wasn't in many ways, a little confusing to follow.
Overall, I liked how the story resolved and how the humans and two different alien species were able to mainly come to a resolution (there are still a few loose ends at the book, but we're told that things are expected to resolve peacefully at the upcoming peace talks. However, this book doesn't have a cliffhanger and appears to bring an end to the series, although I can see where the author does have room to continue with more, but it doesn't appear that she means to.
Interesting resolution in this book and interesting duology, probably a 3.5 stars average.