After being chosen as The Rider of Bivinia by the pegan, Sala, Adenine must choose to enforce her supremacy as Rider and subjugate the Bivinians to her will, or allow Prince Eiridan, her trusted friend and the rightful heir, to take the throne.
New dangers emerge to bring civil unrest to Bivinia. Meanwhile, beneath the city, deadly ancient secrets are uncovered. When history threatens to repeat, Adenine must forsake everything she is, and intended to be.