From Deadline EXCLUSIVE: Screen Gems has made its choice: Jamie Campbell Bower will get the male lead in The Mortal Instruments, the Scott Charles Stewart-directed adaptation of the Cassandra Clare novel series. He'll play Jace Wayland, starring alongside Lily Collins, who'll play the lead heroine Clary Fray. She has The Sight, and can see both demons and Shadowhunters. Jace is one of the best of the latter.
'Immortal Instruments' is another YA novel series that is very good. I fully recommend putting it on your reading list.