I'm invisible. I hide. I wait. On top of the roof where i am free, And no one can get me. 14-year old Calla Silverman lives in a mill with her little sister Robyn,alone. She provides for herself and little sister, until one day where a mysterious boy breaks in. He's quiet and secretive, but Calla soons finds out his troubled past, and it seems they're not so different after all...