Tell and Wren face a wraith—a sorcerer gone rogue—in this third and final book in the Children of the Black Glass middle grade fantasy series that’s Howl’s Moving Castle meets Christopher Paolini! Now a captive in Desert’s house, Wren learns the evil sorcerer has melded herself into a human body to become a wraith. Wielding even more power, more strength, and more magic than ever before, Desert’s still not satisfied…not until she consumes Wren’s too. Tell will stop at nothing to save his sister, and while he lacks magic himself, he discovers one of their friends has mystical powers and is as determined as Tell is to save Wren—the girl who once saved him. Separated for the first time, Tell and Wren are both left to rely on their quick wits, mountain training, and allies old and new to vanquish Desert once and for all. As desperate sorcerers prepare to battle the twisted wraith, they know losing would mean losing the city of Halfway…and each other.