Listened to an audio version of this story. I first read this many many years ago and it has haunted me ever since, and I'm glad to say it's as good as I remember. A missing family in Yellowstone Park, a case of bubonic plague, a boy raised by coyotes, and underground war fought in the tunnels of Vietnam all combine to create something difficult ro define, but moving, and disturbing, and awe-inspiring, and horrifying.