This is one of my favorite books, ever. I first read it when I was a teenager, and eventually gave my dogeared copy to another teenager. I have bought and shared three or four copies over the years.
It is a unique book in that it is a fantasy story in which the protagonist is physically genderfluid, both male and female by turns. Also unique in my reading experience was that it was a book in which several of the characters are queer, and it was mainstream published, and nobody is treated as a stereotype. It’s about growing up in a world where you never quite fit in and in which love and sex are by turns magical and complicated and frightening.
I have recommended this book to many people, and it holds a special place in my heart, as girl who wore suits and hung out with boys in dresses. I might even say it’s like Tolkien for Queer kids.