Edmund and the Childe were swapped at birth. Now Edmund lives in secret as a changeling in the World Above, with fae powers that make him different from everyone else—even his unwitting parents and older sister, Alexis. The Childe lives among the fae in the World Below, where being human makes him an oddity at the royal palace, and where his only friend is a wax golem named Whick.

But when the cruel sorceress Hawthorne takes the throne, the Childe and Edmund realize that the fate of both worlds may be in their hands—even if they’re not sure which world they belong to.