I am so excited about and interested in this book! I have heard great things about this author, and really want to test out her writing for myself. I was hooked right away from the tag line on the cover: "Two sisters. One dangerous secret. 24 hours to uncover the truth." I had no idea that this book was a mix between fantasy/sci-fi and mystery and I am so excited. I have loved the majority of books like that that I have read. The city reminds me of Atlantis, and yet is still something so unique that I have never read about in YA before. It will be interesting to learn more about their society and how they survive living on the water in the midst of the flooded planet. The cover made me think this was a mystery, which it has elements of, but seems primarily sci-fi.