Lost Within The Shadows

Little girl,
Not so innocent now,
I know what you've done,
It was a very bad thing,
Now listen to me,
You don't know who am am but here is a hint,
I lurk in the shadows hidden away from sight,
I see everyone but no one sees me,
I know what happened on July 4th,
Imagine what would happen if your secret got out,
Do what I say or pay the price.
-S