The first day of school

Clary is a normal 16 year old girl. She is an art prodigy, but She won't admit it to herself. Who likes a self-centered maniack? She tells herself all the time.
Things start to change after some new students come to her school in New York.
Simon -her best friend- doesn't think that the new students are good, because they have tattoos all over their bodys, of course Simon won't say anything (he finally learned that they were temporary).
What will happen when Clary finds out something that she is not supposed to find out? Or is it all a lie?