High Quality Content by WIKIPEDIA articles! The Infernal Devices is a series of novels by author Cassandra Clare, centering on a race called the Shadowhunters introduced in her The Mortal Instruments series. This series takes place in Victorian England, ten years after the peace treaties between the demon-fighting Shadowhunters and Downworlders (vampires, faeries, werewolves, and warlocks) was signed. As Shadowhunters consider themselves superior or purer than Downworlders and demons, they may have few qualms about killing either. The first book in The Infernal Devices is entitled Clockwork Angel and begins the story of Tessa, an orphaned teenage girl who is looking for her brother, who has disappeared, and seeks her true identity.