To save her mother’s life, Clary must travel to the City of Glass, the ancestral home of the Shadowhunters – never mind that by doing so she is breaking the Law, which could mean death. Even worse, Jace does not want her there, and Simon has been thrown in prison by the Shadowhunters who are deeply suspicious of a vampire who can withstand sunlight.
Luckily, Clary finds an ally in the mysterious Sebastian, who holds a strange attraction for her. As Valentine musters a demon army, can Downworlders and Shadowhunters put aside their ancient hatred and work together ? And can Clary harness her newfound powers to help save them all – whatever the cost ?