Chroniken der Unterwelt
There is a prequel trilogy called "The Infernal Devices", which is set in the same universe as "The Mortal Instruments", but set in the Victorian era. This consisting of three books: "Clockwork Angel", published on August 31, 2010, "Clockwork Prince", published on December 6, 2011, and "Clockwork Princess", published on March 19, 2013.