Cordelia Carstairs is a Shadowhunter, a warrior trained since childhood to battle demons. When she travels to London, she encounters childhood friends James and Lucie Herondale and is drawn into their world of glittering ballrooms and supernatural salons. All the while, she must 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. Trapped in the city, Cordelia and her friends discover that a dark legacy has gifted them with incredible powers – and a brutal choice will reveal the true cruel price of being a hero.