She can see the Line from the greenhouse windows, but she is forbidden to go near it. Across the Line is Away, and though Rachel has heard many whispers about the dangers there, she's never really believed the stories. Until the day she hears a recording that could only have come from across the Line.
It's a voice asking for help.
Who sent the message? What is her mother hiding? And to what lengths will Rachel go in order to do what she thinks is right?