Seventeen-year-old McKenna Duvall is whisked away by her father on a graduation trip to the Palasca Mountains in France. She spends weeks enjoying what the French countryside has to offer. On a morning hike, McKenna wanders off far up into the mountains and gets lost. It begins to rain, she quickly discovers a cave, and takes shelter. Out of the shadows emerges a gentle vagrant, Keyan McGrath. Keyan's past contains dangerous secrets. But when an unexpected friendship blossoms, he is forced to reveal them. One being that he is an Amaranthine.