Really excellent! I was a little skeptical going in, because I'm not a huge fan of the knights + dragons + witches kind of fantasy, and I'm certainly not a fan of romance plots, but it's just an excellently written book. The magic system is unique and serves the themes of the book beautifully, and the world building is captivating. It runs a little lengthy, but that can be forgiven. I think anyone interested in designing magic systems or fantasy worlds should be taking note.