Pandemonium picked up right where Delirium left off. In a completely new setting, Lena is forced to adapt to the trials and tribulations of living in The Wilds. The constant conflict between The Wilds and the cured cities are very present throughout the book, with Lena taking a definite side. 
 This book is definitely more of a traditional dystopian and survival than a romance like Delirium was. Lena had to learn how to adapt to living with the Invalids, where each day is harsh and unpredictable. That's not to say there wasn't romance, because there definitely was. However, I'm not sure how much I support this romance. I'm still trying to decide whether or not I like Julian. Hopefully my opinion can be helped by the third book. 
 I really enjoyed the personal changes that Lena went through. She's a much stronger character now, using her pain and experience to help motivate herself and push forward. She isn't as naive as she was in the first book, which I'm very happy about. She's also more open to questioning the world around her and making her own decisions. 
 All I can say about the ending is OH. MY. GOD. 
 Another cliffhanger that has left me dying with anticipation for the third book!