It's Drusilla Blackthorn's third year at Shadowhunter Academy when a chance encounter at a nightclub turns into a kidnapping. Dru finds herself held prisoner by Prince Ash Morgenstern in the land of Faerie, a place that proves just as dangerous as it is beautiful.

Despite herself, Dru is drawn to Ash and the darkness that seems to surround him - but one false move could cost her life. Meanwhile, a shocking disappearance rocks the foundations of the Shadowhunter world. Kit Herondale and Ty Blackthorn must set aside the bitterness that lingers between them and join forces on a perilous quest to save everything they cherish.