The Kingdom of Back by Marie Lu tells the story of Mozart and his older sister Nannerl when they were children and the fantastical world they discover together through their musical talent. I absolutely love how Marie Lu based this story on sources she found while reading about Mozart. She discovered that he did have a sister and they shared compositions along with their love of music, as well as their co-created stories of the Kingdom of Back. The historical based story fascinates me and I enjoyed every minute reading this fantasy. The struggles Nannerl dealt with because of the day and age she was born in were unfair but she persevered as much as she could. I love this story and give it a full 5 stars!