Screen Gems has released the first image from its upcoming adaptation of The Mortal Instruments: City of Bones, the first book in Cassandra Clare’s bestselling young-adult series about a teen who discovers her demon-slaying skills while attempting to rescue her mother from an evil entity.

The shot features pretty French actress Jemima West as Shadowhunter Isabelle Lightwood (posted above). Shadowhunters, known collectively as Nephilim, are age-old human demon-slayers born with angel blood, dedicated to protecting mortals.

The Mortal Instruments: City of Bones is directed by Harald Zwart (Karate Kid 2010) and stars Lily Collins as protagonist Clary Fray. Co-stars include Lena Headey (”Game of Thrones”), Jonathan Rhys Meyers (“Dracula”), Jamie Campbell Bower (Twilight: Breaking Dawn) and Kevin Durand (“LOST”).

It arrives in theaters on Aug. 23, 2013.