It's a fantasy book placed in a grim future where the sun no longer gives enough warmth for humans to live by, so the untouchable caste are enslaved to mine for coal. Countless taboos are shattered when Elsha, an idealistic and rebellious Quelled girl, is chosen to be handmaid to the Firelord--the man revered by those calling themselves the Chosen. Very predictable at times, but it really doesn't matter, because it's well written and enjoyable just the same.