I Shall Wear Midnight by Terry Pratchett
My sister pointed out that although this is clearly marked as "for young readers" the very start of the book has heroine Tiffany Aching dealing with a man who has just beaten his pregnant 13 year old daughter so severely that she has a miscarriage. I do wonder whether some parents would be taken aback by this. Though to be honest, I read a lot of fairly harsh stuff as a young reader: My mother didn't shy away from encouraging me to read a lot of dark but wonderful sci fi at age 8 or so when I became a voracious consumer of books. I didn't find I Shall Wear Midnight quite as playful as some of the other discworld novels, but it made up for it in other ways. I do so love the wtich stories for the common sense magic and not magic that permeates them.