By Erin Strecker
Updated November 15, 2012 at 05:13 PM EST

It’s time to trade in your vampires for demons. Where one book-to-movie phenomenon ends, another begins.

The Mortal Instruments series, by Cassandra Clare, is a popular young adult book franchise centering around half-angel Clary Fray. We now have our first peek at the film version, starring Lily Collins as Fray. In the trailer, we get a glance at the trusty band of Shadowhunters (half-angels who have the power to kill demons), as well as a proper introduction to Jace (Twilight and Harry Potter alum Jamie Campbell Bower) and a glimpse of The Institute.

Previously, Clare told EW that the casting she was most excited about was Jared Harris, who will portray Hodge, and Robert Sheehan for Simon.

Fans and new recruits alike, check out the first trailer below:

The Mortal Instruments: City of Bones will hit theaters Aug. 23.

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The Mortal Instruments

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