Screen Gems is developing bestselling book series “The Mortal Instruments” into a possible film franchise, starting with the series’ first installment “City of Bones.” Screen Gems will team with Constantin Film and Unique Features on the project. The “Mortal” series is by author Cassandra Clare. “City of Bones” tells the story of a seemingly ordinary teenager who discovers she is the descendent of a demon-hunting clan called Shadowhunters. Pic is penned by Jessica Postigo, with Constantin’s film and TV head Martin Moszkowicz exec producing and Robert Kulzer producing. Michael Lynne and Robert Shaye will also produce, along with Dylan Sellers.
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