From internationally bestselling author Cassandra Clare comes the first novel in a brand new Shadowhunters trilogy. Evil is hiding in plain sight and the only thing more dangerous than fighting demons is falling in love. Cordelia Carstairs is a Shadowhunter; a warrior trained since childhood to battle demons. When her father is accused of a terrible crime; she and her brother travel to Edwardian London in hopes of preventing the family's ruin. Cordelia's mother wants to marry her off; but Cordelia is determined to be a hero rather than a bride. Soon Cordelia encounters childhood friends James and Lucie Herondale and is drawn into their world of glittering ballrooms; secret assignations; and supernatural salons; where vampires and warlocks mingle with mermaids and magicians. 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 a shocking series of demon attacks devastate London. These monsters are nothing like those Shadowhunters have fought before - these demons walk in daylight; strike down the unwary with incurable poison; and seem impossible to kill. London is immediately quarantined. Trapped in the city; Cordelia and her friends discover that their own connection to an dark legacy has gifted them with incredible powers - and force a brutal choice that will reveal the true cruel price of being a hero.