Clarissa 'Clary' Morgenstern and Isabelle 'Izzy' Lightwood are parabatai. They've grown up together, had each other's backs since forever. Then, everything changes when Clary's father, Valentine, is murdered. Clary, along with her mother and brother, come to live with her parabatai at the New York Institute. With the downworlder population on the brink of war and Valentine's murderer lurking in the shadows the girls' parabatai bond will be put to the test. Can it survive? Or will it come crumbling down like everything else in Clary's life? A Shadowhunter AU if the Circle wasn't even and if Simon wasn't in the picture (or at least the nerdy Simon we all know and love).