I love nothing more than when a book (or a series) surprises me. And that's what the Delirium Trilogy did. 
 It's set in a dystopian world where love is considered a disease, and all citizens have a medical procedure at age 18 to 'cure' them, or to stop them becoming infected. 
 Requiem is the third book in the trilogy, and though it has an open ending (and I usually despise books with open endings), it is done quite well, and I'm not left wanting. 
 This story is told from two POV - Lena, and her best friend Hana. At first I thought Hana's chapters would be boring - as she has been 'cured' but I loved them. 
 We see some good character growth, especially from Hana. 
 Overall a satisfying read, I'm rating it 4 stars.