Cordelia Carstairs, a Shadowhunter trained to battle demons, travels with her brother to London where they reconnect with childhood friends but soon must face devastating demon attacks in the quarantined city. Edwardian London, a time of electric lights and long shadows-- with demons waiting in the dark. For years there has been peace in the Shadowhunter world. James and Lucie Herondale have listened to stories of good defeating evil and love conquering all. But everything changes when the Blackthorn and Carstairs families come to London-- along with a remorseless and inescapable plague. James believes he has found love in the mysterious Grace Blackthorn. Cordelia Carstairs is desperate to become a hero, save her family from ruin, and keep her secret love for James hidden. When disaster strikes, dark and incredible powers are revealed-- as well as the true cruel price of being a hero.