This book was one of my favorites! I would definitely like to read more books from this author. The story is about the Mozart Family. Wolfgang Mozart and his sister create this secret world that they call the Kingdom of Back. Nannerl feels like she is always in the shadows of her brother. She has the same musical gifts, but she is a girl which means she does not have the same opportunities as her brother. Nannerl makes a deal with a boy in the Kingdom of Back known as Hyacinth. He appears to have her interests and wants to help her become well known and not forgotten. Is he what he says he is, and does he really want to help her? You should really read this book and find out. It also lets you glimpse into the life of the Mozart family. I loved it!