I may be slightly biased when I say this, but this book was absolutely wonderful! I love all of Marie Lu's work, and this was no exception. In this book, she takes the story of Mozart and shakes things up by adding his sister, Nannerl, to the mix. In this book, Nannerl is just as talented (maybe even more so) as her brother, but because she is a young woman and it is the 18th century, she has little hope of ever seriously pursuing her dream. Fantasy is then brought into the story when a mysterious and secretive figure offers Nannerl the chance of a lifetime. But is it too high a cost? This book is just gorgeous, inside and out (no really, the cover is a dream!) and it shows just how far some people have to go to make their dreams come true!