As a fan of this author's first book, I was excited to see she had written another. Unfortunately I liked the idea for this one but the execution just wasn't there for me.
Just like with her other book, this book is more plot driven. The characters end up flat and there is nothing really there for me to latch onto and be intrigued by them. Tempest is a bit selfish at times and I guess it is understandable since she is dealing with reviving her sister. Death isn't an easy subject after all. She really just lets her sister take the lead. Elysea didn't give me anything besides coming back from the dead. I mean, if it wasn't for her coming back there wouldn't be a plot but at the same time she doesn't do too much.
As for the other characters, they don't bring much to the table. There is one plot twist that involves one of the guys in this book but it wasn't a surprising one. It felt obvious due to what we find out over the course of the book when it comes to the research facility.
The reason I continued this book and rated it a bit higher was because of how unique the setting and plot is. I have read a book like this before even if the world felt a bit underdeveloped. I would have liked more information as to what caused the great wave and how people managed to survive after it. Where they live isn't described either so it was hard imagining it all. I like to have a clear picture while reading.
The ending also felt rushed with one extra plot point added in at the end.
Overall, it was a decent book. It was unique but at the same time lacked in various ways.