The Kingdom of Back is a wonderful blend of historical fiction, classical music, fantasy, and coming-of-age. Marie Lu lovingly expands on the tale of Nannerl Mozart, the much lesser known sister of Wolfgang. The struggle to be remembered in her own right leads Nannerl, and later her brother, to a magical kingdom accessed through her music, stories, and dreams. You don’t need to have a knowledge of classical music to appreciate this story. Although there are certainly little treasures of reference sprinkled throughout the novel, giving it just one more level to appreciate.