River Willow, a college student, returns to her hometown for Christmas break. On the way, she accidentally becomes a witness to a ДТП: an unknown man is hit by a car right in front of her. The injured man disappears, and on River’s hand remains an unusual mark—two punctures resembling a snake bite. Trying to understand what happened, River soon realizes that she has involuntarily been drawn into an old conflict that has been going on for more than a century…