Clary has to use all her ingenuity and newfound magical skills to get herself to the Glass City in Idris, the secretive Shadowhunters' home country, where she is forbidden to go--for it is only there that she can find the cure to her mother's enchanted sleeping sickness. When Valentine attacks the city and destroys the demon towers, Clary and her allies are all who stand between him and the total annihilation of all Shadowhunters. Love is a mortal sin and the past tangles inextricably with the present as Clary and Jace face down their father in this third volume of The Mortal Instruments.tine in the final installment of the New York Times bestselling trilogy The Mortal Instruments.