Monsters 101, Book Nine: "Speak of the Devil"

Way back in Book Three, Mort left a horrible mess behind in the devil world of Dharokalee... and we mean horrible! Kymbir, the princess of Tcharen Koh has unleashed her considerable magick might upon her people because of the heartbreak the boy sorcerer caused. The remaining royal family has recruited Mort to save them, but what can he possibly do to control a woman who destroyed a ten million year old city of magicians because she was mad at him?