All fall down by Ally Carter
It is about a girl and that nobody believes her and there is no-one that she can trust. Her mother was murdered and some day she is going to find the killer and make him pay.
a girl called grace her past has came to haunt her and if she doesn't stop is Grace isn't the only one who will get hurt.
I think this is a good book because you can not stop reading it. So go and read it.