Erilea is in danger. The Demon King Erawan has plunged the continent into chaos. Celaena Sardothien, now Aelin Galathynius, Queen of Terrasen, who swore to save her people, has fallen victim to the demon Queen Maeve. The Fae ruler has captured Aelin and imprisoned her in an iron coffin. Maeve's goal is to torture her captive for the location of the Wyrd Keys, ancient artifacts that open the Gates between the demon and human worlds. But if the captive submits and the Keys fall into Maeve's hands, hordes of demons will overwhelm the world, and all Aelin holds dear will surely perish. This realization gives her strength, and she resolves to take extreme measures...