In this thrilling conclusion, Charity and her friends must help Aidan defend the fortress against a militia led by Aidan's "disenfranchised" human half-siblings who want only one thing: the power of the Klaas. Everything is on the line as Charity must venture into a terrifying world called The Withering to find someone named Perchta, supposedly their last hope for help. But will Charity survive the strange creatures and even more shocking truth that await her?