Two U.S. Park Rangers are ambushed and murdered in Horseshoe Canyon. Missing are a young woman archeologist and a local rock collector. Deputy Sheriff Hosteen Nalje (Hastiin Nalzheehii) and National Park Service Special Agent Mai Yazhi must work the case that soon becomes a hunt of ancient artifact thieves on a killing spree. All of this under the shadow of the 10,000-year-old Ghost Wall in Horseshoe Canyon, Utah.