* Fantasy: The core of the story involves magic, fairies, and other mythical creatures.
* Adventure: The Grace siblings embark on a quest to learn about and protect the faerie world.
* Coming-of-age: The story explores themes of sibling rivalry, self-discovery, and growing up.
* Children's Fiction: The series is geared towards middle-grade readers, featuring themes and characters appropriate for that age group.
While it's primarily fantasy, the combination of adventure, coming-of-age themes, and its intended audience for young readers makes it a unique and engaging story.