The video focuses on Lily Collins's character Clary Fray and her life before and after she discovers an incredible secret about herself.
Clary lives an ordinary life with her overprotective mother (Lena Headey) until she begins to see warriors and monsters fighting in the streets of New York - a struggle apparently invisible to ordinary people.
When her mother goes missing, Clary is tipped headfirst into a fantastic world where she discovers she is a Shadowhunter - a half-angelic being destined to protect the world from the forces of darkness.
Jamie Campbell Bower, Jonathan Rhys Meyers, Robert Sheehan, Kevin Zegers, Kevin Durand, Aidan Turner, Jemima West, Godfrey Gao, CCH Pounder and Jared Harris also star in the Harald Zwart-directed adaptation of Cassandra Clare's young adult novel.
The Mortal Instruments: City of Bones will debut on August 23.