The Mortal Instruments : City Of Fallen Angels Book Four

Clary is back in New York and life is good: she's trainning to be a Shadowhunter and finally able to call Jace her boyfriend. But nothing comes without a price. When Jace inexplicably begins to pull away from her, Clary is forced to acknowledge that she herself has set in motion a chain of events that could lead to the loss of everything she loves. Even Jace.