The trailer for Cassandra Clare’s next novel, City of Lost Souls, is now out. It is the next novel in The Mortal Instruments series.

EW has the exclusive debut (we are unable to embed). The official synopsis reads:

City of Lost Souls finds Jace freed from the demon Lilith’s captivity but horribly changed by her dark magic. Jace is now bound to the evil Sebastian, and the Clave must band together to break the impenetrable bond between them. Clary still believes that Jace, the boy she loves, can be saved — but she and her Shadowhunter allies in for a fight that will challenge both heaven and hell, and Clary must venture into the heart of darkness herself to save him. The new trailer focuses on Sebastian, and wow, we have every reason to fear his wrath.

The first screen adaption of the series is underway with Jamie Campbell-Bower and Lily Collins taking on the lead roles and is set for release on August 23, 2013.

Which of The Mortal Instruments books is your favorite?