Good news or bad news

Clary Fairchild has lived with boys since her mother died...that is if you count Magnus Bane a boy.
What happens when her guardian Luke tells them some bad news. There have been too many demon sightings in New York or that she now has to go to a MUNDANE SCHOOL. How will she survive. But when she meets the amazing Jace Herondale what will her many brothers do?