Arnaka Skytree grew up believing she was chosen to bring new magic to the world. As the heir to the cult of druids responsible for keeping their floating palace habitable for the wealthy aristocracy, she's expected to wield her power as those before her did: by culling the souls of peasant women.

But when Arnaka learns more about the source of her magic, and that her best friend's soul will be harvested, she embarks on a journey to end the barbarous practice and to restore a long-forgotten harmonious system of magic practiced by the original druids. Along the way, she discovers she's not the only girl chosen to restore balance to their world—many others have powerful magic inside, and with them, she will tear the floating palace from the sky so everyone can live in the sun—out of the shadow of the eclipse.