Something haunts the desert, something that was once an opinicus. Cherine--scholar, adventurer, metal-beak, and popular kidnapping victim. While his old mate and friends fight for his amnesty, he lives out his exile in the aneda forest. When Zeph and Kia approach him about hunting down the infamous Nighthaunt, he's all too happy to leave his hovel behind. Little do they know that the key to finding the most dangerous criminal the world has ever known lies in the abandoned eyrie of Crestfall. Long silent, something lurks in the shadows of the city, and its homes may not be as abandoned as once believed. Will Cherine and his friends unravel the mystery of the desert eyrie in time, or will they become the hunted? The Ruins of Crestfall is a full-length creature fantasy novel full of fan-favorite characters, desert monsters, fancy opinicus armor, and charming sand gryphons.