Synopsis: Sideshow sharpshooter Billy Donovan (the legendary Johnny Mark Brown), while staging a demonstration in a Texas settlement, is approached by rancher Jean Halloran who needs help in disposing of a "phantom" sniper who has already killed her brother and seems intent upon driving her brother and crippled stepfather off the land. The superstitious townsfolk believe the intruder is a ghost that haunts an abandoned mine. Donovan accepts Jean's challenge, disclosing an agenda of his own. Untraceable gunfire continued to plague the rangeland when Donovan stumbles upon a tunnel leading from the mine. He follows a mysterious character to a hidden doorway which opens into the basement of the Halloran ranch house!