About a Boy

(AU)Isabelle Lightwood thinks she has it all figured out: she goes to an elite private school, earns flawless grades, has the perfect boyfriend. She's the star of her school's track and cross country team. But then she transfers to the school where her brothers go. And with that school comes a problem. And it's about a boy. Rated T for language. Sizzy/Clace/Malec. Cover is not mine