The second book in The Infernal Devices series follows Tessa Gray as she becomes deeper entangled in the Shadowhunter world of Victorian London. As tensions rise within the Institute, secrets about her origins come to light, and a dangerous love triangle intensifies between Will Herondale and Jem Carstairs. Blending romance, betrayal, and supernatural danger, the novel expands the gothic fantasy world of the Shadowhunters.