City of Heavenly Fire

The last book in Cassandra Clare’s Mortal Instruments trilogy is titled “City of Heavenly Fire.” It centers on Clary Fray and her companions as they go up against Sebastian Clary’s brother who is turning Shadowhunters into terrifying monsters. Demons can now easily attack the world as the Shadowhunters withdraw. The party is forced to enter the demon realms a region no Shadowhunter has ever survived after a major betrayal.