Lightfall: The Dark Times

"Danger lurks as the air grows colder and threats lie in the shadows at every turn. While the rest of their fellowship seeks safety, Bea and Cad team up with a small group of survivors to travel to the Citadel of Knowledge, pursuing answers to their world's darkest mysteries. But their journey reveals even more secrets--until an unexpected ally shines a light in the darkness, providing a clue to a mystery from long ago and a beacon of hope for the futur"--