The Angels and Demons of New York

Clary Fray isn't Clary Fray anymore. She's a demon of hell, or namely Beezelbub, in charge of all the creatures of the underworld and pitted against her old friends the Nephilim. But when humanity is threatened by Lilith's shadows, it's up to Clary, her now angel brother Jonathon and their armies of heaven and hell to stop her. But why is Clary like this? What happened that day..?