Clockwork City

This is a mortal instruments and infernal devices by Cassandra Clare crossover. Jace and Clary find themselves in 1878-London. They know they must do something there but they don't know what. They meet up with the Shadow hunters from the London institute and seem to be getting along when something happens they did not...

The Mortal Instruments: City of Past Ghosts (Book 1)

Clary is pronounced dead by the Clave, leaving Jace heartbroken and never the same. But when Jace saves a mundane that isn't a mundane at all and bares great resemblance to his dead Clary (not to mention the same name), questions and the past ghosts are raised, once again making him question the Clave. But convinced...