Can anyone recommend anything similar to the children-appropriate Discworld ones like The Amazing Maurice for my nearly 10-yr old (pretty mature and probably reading at 11-12yrs+ level). He's loved the silliness of the Knight Sir Louis books but I think is ready for something cleverer, IYSWIM. He enjoys fantasy and LOVED the Hobbit, also loves Michael Morpurgo and the Tim Diamond detective ones by Anthony Horowitz.