Lina Winterbock lives in the mountain strongholds of Solace. She’s an apprentice to the archivists and should be spending her days with books, but the Iron War has changed everything—it’s too chaotic to study. The strongholds are now a refuge, so instead of learning about how to preserve the objects that mysteriously fall from the sky, she whiles away her time exploring the hidden tunnels and passages of her home. And in one of the forgotten chambers, Lina discovers a secret. Hidden deep in a cavern is a half-buried airship like nothing she has ever seen before. Then she meets Ozben, a mysterious boy who has a secret of his own—a secret that’s so dangerous it could change the course of the Iron War and the world of Solace forever.