Love cuts deeper than any blade. Cordelia Carstairs is a Shadowhunter, a warrior trained since childhood to battle demons. When her father is accused of a terrible crime, she travels to London in hopes of preventing her family's ruin. There, Cordelia's childhood friends James and Lucie Herondale draw her into their world of glittering ballrooms and supernatural salons. All the while, Cordelinemust hide her secret love for James, who is sworn to marry someone else. But Cordelia's new life is blown apart when demon attacks devastate London. Now trapped in a quarantined city, Cordelia's friends discover that their connection to a dark legacy has gifted them with incredible powers and forced a brutal choice that will reveal the cruel price of being a hero.