Very unexpected. There's an element of horror to this book that keeps it a bit above the standard YA family-problems book. Chloe's sister, Ruby, has power that is undefined, undetermined, but very real. The two sisters live for one another and when a choice that Ruby makes turns living into a challenge for Chloe, the story takes off.I was pulled through this book by my urgency to understand what Ruby was. At the end, I didn't have my answer in black and white but I know what she was. She was the light in all of us that pushes us to do whatever we need to do to keep what we love.I found some of the passages of the book to be beautiful. The secondary characters are not developed because they don't need to be. They are there to serve the sisters and they do it well. No love story here between boy/girl. The love here is all about family.