Another very entertaining T. Kingfisher book. This one takes two of her common character types, a put-upon young girl, and a cantankerous older woman, and makes them co-protagonists, trying to escape the plans of an evil sorceress, who happens to be the mother of the former and potential sister in law of the latter. Supposedly this is a Goose Girl fairy tale retelling, but it's really more lightly inspired. But whatever it is, it all really worked.