I'm currently enjoying Emily Wilde's Encyclopaedia of Fairies, and I think my advanced-reading 9 year old would really like a story immersed in that kind of traditional fairy lore.
She recently loved Neil Gaiman's Norse Mythology so it doesn't need to be aimed specifically at children, and I definitely don't want tinkerbell-sweet-little-garden-pixies kind of thing, but Emily Wilde's vocab is maybe just a bit advanced.
by finestgreen