Jim Henson's Beneath the Dark Crystal (Jim Henson's Beneath the Dark Crystal #12)

The Glass Castle, home of the Firelings and their final protection, is under siege-and Thurma cannot defend it alone. But as her former rival, Nita, and the rest of her people come together, Thurma realizes that she has never been alone, and that working together is the only way to defeat The Fire That Stays.