City of Glass

Cassandra Clare

One internal conflict is inside Clary trying to decide whether or not she should attempt to prove her love for Jace because up until the end of the book she thinks that Jace is her brother but it turns out his whole upbringing was a lie and he is not actually related to her. An external conflict is between the shadowhunters and the army of demons that Valentine has summoned to fight the shadowhunters. In the end once Valentine is killed the demons disperse and the shadowhunters way of life is returned to normal.