This is a tale of two quests: Cara Diana Hunter's search for an ancient story that may unravel the secret of the long enmity between the unicorns and the delvers, and her father's journey to free Cara
In the center if Luster stands an enormous tree called the Axis Mundi, the Heart of the World. But now that tree is wounded, pierced through by magic. And through that wound marches an army of Hunters
