a point at which it becomes difficult for an adult to access the book. i don't think this is a bad thing, by the way -- authors who can do that are very, very special. it's just a matter of getting to the book at the right time.
part of it may be that i find her books, and enchanted glass especially, to be a little... brief? i am not sure of the right word. it's hard, because i'm not sure i feel like this with any other books for kids, and i'm not sure why i do with this one. it's like i skip across the surface of her books 