Joe Pickett, having recently been fired from his job as a Wyoming game warden, is working on his father-in-law’s ranch when he receives a call. Governor Rulon - a devious but down-home politico - has a special request.

Clay McCann, a lawyer who slaughtered four campers in cold blood in a far-off corner of Yellowstone National Park, had immediately turned himself in at the nearest park ranger station - except that the crimes were committed in a thin sliver of land with zero residents and overlapping jurisdiction, the so-called free-fire zone. Neither the state of Wyoming nor the federal government can try him for his crime, so he walks out of prison a free man.

The governor will reinstate Joe as a game warden if he’ll go to Yellowstone to investigate. Joe, happy to get his badge back, even under these circumstances, agrees. However, it quickly becomes clear to Joe that McCann is deeply involved with something tremendously lucrative and unusually dangerous.