This book overall was a very good squeal to the equally amazing "Delirium". I don't want to give away everything that happened in this book for the reason of: It was an amazing book and you should read it for yourself. That being said there will be some parts revealed including the huge cliffhanger (I'm starting to see a trend). 
 (view spoiler)[Alright so one of the first things that stuck out to me about this story was its set up. The "chapters" were divided by Lena in present time (in Brooklyn) and Lena in the past (in the wilds). And I use the term "chapters" very lightly because in the end the author sticks with one time period for 80+ pages. 
 Another thing that slightly, for lack of a better word, annoyed me about this book was that there is a new love interest for Lena, Julian. By then end of the book I almost couldn't decide who I like more. (I say almost because in my opinion Alex will always be the one for her.) First, there is Julian, who is the son of a top leader of an organization for a Deliria-Free America. I am just going to skip the part where Lena and Julian get to know each other because I don't want to just retell the entire book. But all in all Lena infected Julian with "love" and all is happy....so you think. But then there is Alex, her first love, the one who showed her that any of this was possible. And as a comparison Alex was the one who showed Lena how to love, and Lena was the one who, in turn, showed Julian how to love. So, simply put, Lena was the Alex of the relationship with Julian. 
 AND THEN THERE IS THE CLIFFY! I honestly both dislike and respect the author for the cliffhanger. Dislike because it is in fact a gargantuan cliffhanger that makes me angry that I have to wait so long for the next book. But I also respect the author, because she has created such a fascinating book that, though the cliffhanger is quite angering, I feel that it doesn't take away from how great the book, in its self, was. So, here it is....the cliffhanger....Alex is alive! Now, in hindsight, I never really thought he was dead, but just the way the author reintroduced him back into the story (On the very last page I might add) was the foreshadowing of an amazing finale to this series. (hide spoiler)]