The final flight to Reyes' home took about forty-five minutes by helicopter through treacherous mountain passes and valleys. Occasionally he pointed out volcanoes to her, glaciers and lakes. She shivered and craned her neck, staring in open-mouthed awe at rugged scenery she had never even thought to hope to see in her lifetime.

When they finally landed, Casey was surprised at how energized she was despite her lack of sleep. Her body felt as though it were on some kind of high. ...