After the success of Twilight and The Hunger Games, film executives all over Hollywood are presumably falling all over themselves trying to find the next series of young adult novels that could become a film series cash cow. Smart money has to be on the upcoming adaptations of Cassandra Clare’s ‘Mortal Instruments’ series of books, the first of which is called ‘City of Bones.’ They’ve got everything a young adult series needs: a protagonist with a vague destiny, supernatural shenanigans, monsters to be killed, a love triangle involving a bad boy and a nice guy; everything. Two of the main roles for the ‘City of Bones’ adaptation (just called The Mortal Instruments) have been filled for a while. Director Harald Zwart (The Karate Kid) has cast Mirror Mirror star Lily Collins as the protagonist, Clary Fray, a girl who finds that she has ties to a race of mystical demon hunters called Shadowhunters, and Jamie Campbell Bower as Jace Wayland, the troubled and mysterious Shadowhunter who Clary develops a crush on. And now things seem to finally be picking up on the casting front, because Variety has a report that Zwart has started the process of filling the film’s villain roles.