Amazing! There were so many great things to like about this book. I loved all the major characters; Lena, Alex, Hana and Gracie. I also loved the writing. Lauren Oliver is a fantastic writer. A lot of YA books tend to be written "down" or less complex than adult books (i.e. Twilight) and I didn't get that feeling from her writing. As I was reading I was pretty certain that I figured out the "solution" to Alex and Lena's problem. I was so sure of it that I would have bet money on it. It was a pleasant surprise to find out I was wrong. Who wants to read predictable books all the time? 
 I typically don't care for cliffhanger endings, but since this book was so good and the next book comes out in February I can handle it.