Production on the young adult adaptation The Mortal Instruments: City of Bones begins next month, and now a few exciting casting additions have been announced.  Based on the first book in Cassandra Clare‘s novel series, the film centers on a young woman (Lily Collins) who discovers she is the descendant of a line of secret cadre of half-angel warriors locked in an ancient battle to protect the world from demons.  Jaime Campbell Bower is set as the male lead, Jace Wayland, and now it’s been announced that Game of Thrones actress Lena Headey, Mad Men’s Jared Harris, and Godfrey Gao (All About Women) have joined the cast.  Hit the jump for details on who each actor will be playing.

Sony Pictures’ genre arm Screen Gems has acquired the Harold Zwart‘s adaptation of The Mortal Instruments starring Lily Collins.  Based on the first book in Cassandra Clare‘s young adult novel series, The Mortal Instruments: City of Bones, Collins will play Clary Fray, “a young woman who discovers she is the descendant of a line of secret cadre of half-angel warriors locked in an ancient battle to protect the world from demons.”  Sony had been circling Mortal Instruments back in February, but decided to pass.  According to Deadline, Constantin Film has come on board to partner on the movie, so it now has the financing to move forward.  We previously reported that filming was set to begin August 15th in Toronto.

According to Box Office Mojo, Screen Gems will release the film on August 23, 2013.  The movie currently has no competition on that date.  Hit the jump for the official synopsis.

Director Harold Zwart (The Karate Kid remake) has boarded Mortal Instruments starring Lily Collins.  The film is an adaptation of Cassandra Clare‘s young adult novel, The Mortal Instruments: City of Bones.  Collins will play Clary Fray, “a young woman who discovers she is the descendant of a line of secret cadre of half-angel warriors locked in an ancient battle to protect the world from demons.”  Zwart previously directed the cringe-worthy family fare Agent Cody Banks and The Pink Panther 2, but I rather enjoyed his remake of The Karate Kid.  He’s certainly a step up from the previous director Scott Stewart (Priest) who left to work on a TV series based on his film Legion.

According to THR, filming on Mortal Instruments is set to begin on August 15th in Toronto.  Hit the jump for the official synopsis.