Mia covered her mouth to keep from crying out. She hated the dark, but her mother had made her promise. But what was the point of being a good little girl if she couldn't help her mother? She'd promised her mother not to scream, but she hadn't promised not to escape... To the world, Mia Thornton is invisible-a quiet, timid preschool teacher. People would never guess that she found the will to dig...