Piper Hayes arrives at the remote fire lookout tower that will be her home for the season. The isolation is immediate and suffocating—miles of black pine forest in every direction, no roads, no neighbors, just the crackle of the radio and the wind. She settles into the ten-by-ten glass room suspended sixty feet above the ground, telling herself the silence is peaceful. But at 3:00 AM, she hears her own voice whispering her name from the darkness below.