I am bad at remembering words, so for the longest time I thought about the wrong person in the previous books while reading about this adventure.
Even with that mistake I loved our protagonist and enjoyed her journey.
I guess as with previous books the social issues were a bit too much in my face, I would have preferred them more subtle. Oh, I don't doubt there's a maths teacher somewhere belittling girls ability to do it well in such an open way, just it hasn't been my experience and books can't afford to be as blunt as reality is anyway. Other than that, I loved the world behind the door in this one, I loved the characters, the book is lovely.