City of Glass is the third book in The Mortal Instruments series, written by Cassandra Clare and published in March 24th, 2009.
Story : -
Amid the chaos of war, the Shadowhunters must to decide to fight with the vampires, werewolves and other Downworlders – or against them. Meanwhile, Jace and Clary have their own decision to make should they pursue the love they know is forbidden?
City of Glass is set in Alicante, the Shadowhunter capital city in Idris. Jace and the Lightwoods travel to Alicante at the beginning of story, while Simon is brought along by accident. After being left behind, Clary summons her own portal to Alicante and walks through, quickly followed by Luke.