An employee of the Bureau of Indian Affairs is in a coma after an attack at a hard-luck mine called Superstition Rock. Because a federal employee is involved, the FBI is called into the case immediately. There have been a series of incidents at the mine that have spooked the American Indian employees. They believe the incidents indicate the mine is near an Indian burial ground. While Erskine supervises the bureau's investigation, Colby goes undercover as an ex-con who is now a new mine employee. The investigation turns up a conspiracy intended to force a sale of the mine. Before the FBI was solve the case, Colby's life will be endangered.