City of Glass is by Cassandra Clare. The third book in The Mortal Instruments Series. To save her mother's life, Clary travels to Alicante to find a warlock who has the cure. Jace does not want her there, and if that's not bad enough, Simon is thrown in prison by the Shadowhunters. Clary and her friends find themselves rushing to prevent Valentine from unleashing his demon army on the city and destroying the Shadowhunters. Parental Warning: This story does elude vaguely to a homosexual relationship.
Ratings: 9th grade - 9 out of 10 - AC (some mature thematic content) - V (violence).