In this gripping third chapter of the Mortal Instruments series, 'City of Glass' sees Clary Fray on a mission to save her mother's life by entering the perilous City of Glass, the heartland of the Shadowhunters. Against the law and amidst reluctant allies and deep-rooted treachery, Clary must navigate a world where love can be a sin and the shadows of the past loom large. As the menacing Valentine assembles his forces, Clary and her fellow Shadowhunters face a convergence of dangerous foes and familial secrets. With the help of the enigmatic Sebastian and her persistent feelings for Jace, Clary's journey for salvation takes her through the labyrinth of their ancient society, and down a path where alliances are precarious, and the true power of her lineage will be tested.