It’s been a while since we’ve reported anything connected to ‘The Mortal Instruments: City of Bones’, the latest young adult novel to make the jump to the big screen. The first trailer came out about four months ago and in between we saw some stills from the movie, but that was about it. But the film made an appearance at this year’s WonderCon, so naturally the studio had something new to display.

Collider tells us that this new trailer was debuted at the film’s panel featuring author Cassandra Clare and principal cast members Lily Collins, Jamie Campbell Bower, and Kevin Zegers. Compared to the first trailer, we get considerably more action this time around. You can check it all out in the trailer below:

Unlike other young adult adaptations like ‘The Host’ and ‘Beautiful Creatures’, this one actually looks interesting enough for me to check out. Although, it’s still a little weird to hear Robert Sheehan, who I know from the first few seasons of the British show ‘Misfits’, speak with a different accent.

For more information on film, here’s the official synopsis:

When fifteen-year-old Clary Fray heads out to the Pandemonium Club in New York City, she hardly expects to witness a murder—much less a murder committed by three teenagers covered with strange tattoos and brandishing bizarre weapons. Then the body disappears into thin air. It’s hard to call the police when the murderers are invisible to everyone else and when there is nothing—not even a smear of blood—to show that a boy has died. Or was he a boy?

This is Clary’s first meeting with the Shadowhunters, warriors dedicated to ridding the earth of demons. It’s also her first encounter with Jace, a Shadowhunter who looks a little like an angel and acts a lot like a jerk. Within twenty-four hours Clary is pulled into Jace’s world with a vengeance, when her mother disappears and Clary herself is attacked by a demon. But why would demons be interested in ordinary mundanes like Clary and her mother? And how did Clary suddenly get the Sight? The Shadowhunters would like to know…

Starring Lily Collins, Jamie Campbell Bower, Robert Sheehan, Jemima West, Kevin Zegers, Lena Headey, and Jonathan Rhys Meyers, ‘The Mortal Instruments: City of Bones’ is coming to theaters on August 23, 2013.