free fire: a joe pickett novel  <b>wyoming game warden joe pickett hunts a mass murderer in yellowstone in this thriller from #1 <i>new york times </i>bestselling author c.j. box.</b> <br /><br /> joe pickett’s been hired to investigate one of the most cold-blooded mass killings in wyoming history. attorney clay mccann admitted to slaughtering four campers in a back-country corner of yellowstone national park—a “free-fire” zone with no residents or jurisdiction. in this remote fifty-square-mile stretch a man can literally get away with murder. now mccann’s a free man, and pickett’s about to discover his motive—one buried in yellowstone’s rugged terrain, and as dangerous as the man who wants to keep it hidden.