The second book in the Infernal Devices series (preques series to the Mortal Intruments) by Cassandra Clare.The first book is called Clockwork Angel.
"In the magical underworld of Victorian London, Tessa Gray has at last found safety with the Shadowhunters. But that safety proves fleeting when rogue forces in the Clave plot to see her protector, Charlotte, replaced as head of the Institute. If Charlotte losses her position, Tessa will be out on the street - and easy prey for the mysterious Magister, who wants to use Tessa's powers for his own dark ends.
With teh help of the handsome, self-destructive Will and the fiercely devoted Jem, Tessa discovers that the Magister's war on the Shadowhunters is deeply personal. He blames them for a long-ago tradgedy that shattered his life. To unravel the secrets of the past, the trio journeys from mist-shrouded Yorkshire to a manor house that holds untold horrors, from the slums of London to an enchanted ballroom where Tessa discovers that the truth of her parentage is more sinister than she had imagined. When they encounter a clockwork demon bearing a warning for Will, they realize that the Magister knows their every move - and that one of their own has betrayed them.
Tessa finds her heart drawn more and more to Jem, though her longing for Will, despite his dark moods, continues to unsettle her. But something is changing in Will - the wall he has built around himself is crumbling. Could finding the Magister free Will from his secrets and give Tessa the answers to who she is and what she was born to do?
As their dangerous search for the Magister and the truth leads the friends into peril, Tessa learns that when love and lies are mixed, they can corrupt even the purest heart."
It's very dramatic, but still wonderful. If you haven't read the Mortal Instruments, then I suggest you start with that, and then move on to Clockwork Angel before reading this book. :D

This actually sounds really interesting :O I may see if the library has it.