Pandemonium was close to a 5 star for me, for no other reason than the ending. The ending ~ grrr!!Oliver has a knack. A gift. A miraculous way of giving you the most infuriating ending possible. It's quite brilliant really. If you make it all the way to the ending of the book, you will have to pick up the next book in the series. You can't possibly not want to know what happens next. That was the way of Delirium and it so much more the case with Pandemonium.We catch up with Lena only days after her heart wrenching, emotionally charged escape into the The Wilds. Alone. She is found, near death, in the woods by a group of Invalids. She is taken in and nursed back to health and finds herself in the middle of the rebellion. The story jumps from 'Then', her time spent in the Wilds - to 'Now', her time as part of the rebellion in NYC. Each chapter switches you to the other time frame. It isn't hard to follow each story (and they do feel like to separate stories) at the same time. It moves fairly seamlessly.Then deals with Lena learning to survive. Survive the Wilds, survive the loss of Alex. Survive life without all she knows.Now deals with Lena infiltrating the largest political action group fighting for the Cure.Then, she meets a wonderful group of odd-ball characters, including Raven. Raven is a tough, no-nonsense woman who Lena will learn much from.Now, she meets Julian. Julian is the son of the most powerful, most influential supporter of the Cure. Julian is sweet, naive and easy to like.Then, Lena learns to let her old self die.Now, Lena learns to love again.Just as her heart begins to heal, she will learn truths that threaten to break it all over again.I can't say more. It is too easy to give spoilers away. If you liked Delirium, you will most certainly like Pandemonium.