Sarah was invisible in her foster home.
No one payed attention to her.
No one talked to her.
No one cared what she did.
One day she went for a walk in the woods and gets attacked by a man in a blue mask. She fights him off and managed to get away, but stumbles and blacks out. She wakes up at the hospital with no memory of who brought her there.
When she was on her way home from school one day she gets in a fight with some boys and they carry her off into the woods and try to rape her.
The guy with the blue mask showes up and kills the boys, then he goes to kill Sara but stopps.