Midge Weaver, despite being fifteen years old, is as mentally capable as a small child. Her mother helps her with some things, but her mother is... unique. She won't let her daughter wash herself with soap, use any sort of technology, refuse food, even if she's allergic to it, or leave the house. The only exception to this final rule? When Midge is sent to school, of course. This means she has seven hours to think and practice free will, an opportunity nobody in her situation could ever pass up. This includes the walk to and from the bus stop, along which she finds an abandoned phone booth. When a voicemail message that strikes Midge as peculiar sticks in her head, she and a friend she makes on the phone from the United States try to get to the bottom of its origins. As the dust settles, Midge's mental retardation begins to give way to disturbing realisations about the world she lives in as she finds out more and more about the girl she'd heard on that voicemail message, one whose fate is just beyond Midge's comprehension.