I loved this book and I loved Oliver's writing.
Delerium is a dystopian novel where they've cured the disease of love and everyone is compliant and complacent and there is very little conflict or crime. You get the operation when you turn 18, typically. Lena, who has looked forward to receiving the cure her whole life, falls in love a couple of months before she is to receive the cure. She also battles the demons of her family's shame: her mother's suicide, an uncle who ran away...
Like I said, Oliver's writing is amazing. At times, it is even poetic. I loved simply reading the sentences she put together.
The characters are well rounded and engaging. I could feel for Lena and the dilemma she was facing - going with what she has been brought up to believe and what her family, government and society expect from her, or to follow her heart. It's an age old dilemma but spotlighted in a dystopian future.
The other characters where great too. Hana, Lena's best friend, was a perfect foil. Their friendship evolved and changed, which felt realistic. Then there was Alex. The romance between Lena and Alex was nice and I appreciated how conflicted Lena was about the whole thing.
Then, there was the ending. I won't say anything to spoil it, but I loved that it was unexpected.
I will definitely be reading the next one in this series, along with everything else by Oliver that I can get my hands on.