Annabel - Lauren Oliver
*may contain spoilers!*
Somehow it seems to me that Lena was the one talking. it's like Annabel thought and talked like Lena. This book offered the back-story of Lena's mom as to the truth of her "cure" and the days back in the Crypts ans how she and her husband met.
This was a nice back-story. Still a lot to be revealed.