Clockwork Angel

In the year 1878, Tessa Gray goes into the spooky underworld of London to find her lost brother. She learns that her friends in this dark world are the demon-fighting Shadowhunters, including two mysterious boys, Will and Jem, whom she's drawn to. They face off against the Pandemonium Club, a secret group with vampires, demons, warlocks, and humans. This club has an army of powerful clockwork creatures and aims to take over the British Empire. Only Tessa and her friends can stand in their way and prevent their plan from succeeding.