Here is the fifteenth magical installment of the New York Times and USA Today bestselling series of fractured fairy tales for fearless kids! Put on your dancing shoes! Believe it or not, there's a fairy named Maryrose LIVING in my house. And she's sending me and my brother, Jonah, through the magic mirror and into the story of The Twelve Dancing Princesses. There, we meet the twelve sisters who sneak out every night to go dancing. But Jonah and I have our own mission. It's up to us to find the enchanted object that will give Maryrose her fairy powers back.