My 11-year-old doesn't typically choose fantasy novels, but she just devoured this series (which is four books right now). This middle grade novel has a bit of Hogwarts magic to it: every Tuesday, Castle Glower rearranges itself, growing a new room or adding a new hallway. The royal family is accustomed to its eccentricities. When disaster strikes, Princess Celie and her siblings team up to save the day. Their pranks will make you giggle even as the story deals with serious themes like grief and fear.