Casting is currently at a fever pitch regarding the next great hope in the Young Adult film franchise arms race, The Mortal Instruments: City of Bones. The most recent news we had about director Harald Zwart’s series-launcher is that Game of Thrones and Mad Men vets Lena Headey and Jared Harris had landed roles as two of the adult characters, and today comes news that two of the teenage roles that make up most of the primary cast have also been filled. The thrust of the City of Bones story, again, is that a girl named Clary Fray (Lily Collins) becomes suddenly involved in the hidden world of Shadowhunters (powerful beings who hunt demons right under our noses). The first Shadowhunter that she comes across is dreamboat Jace Wayland (Jamie Campbell Bower), a troubled orphan who comes complete with a foster family. Said family is most importantly made up of two siblings who Jace lives and hunts demons with, Isabelle and Alec Lightwood. These are the oh-so-important roles that have now been filled.