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On a hot August morning in the small town of Willow Creek, Iowa, Calli Clark and Petra Gregory are reported missing. They are both seven years old, live in the same street, and are the very best of friends. Calli has suffered from selective mutism from the age of four when she witnessed a traumatic event in her home. As a result Petra has become Calli’s voice, speaking for her and is even able to tell others what Calli is thinking.