Still reeling from her terrifying confrontation with the Magister and her brother's betrayal, Tessa Gray is drawn ever deeper into the Shadowhunter's dark underworld of demons and danger. In a desperate attempt to help her friends, Tessa tries to uncover the truth about the Magister and learns that blames the Shadowhunters for the murder of his parents nearly a half century ago. But who were his parents, and why did the Shadowhunters kill them?