When an Indian agent is murdered and another is injured when he comes to investigate the murder, Roy, Dale, and Pat turn to the old Indian chief to find out what's happening. Through the course of their investigation, they soon discover that an old miner has found a gold vein inside the old salt mine on the reservation and wanted to keep the gold for himself.

Sheriff Blodgett suddenly leaves town, and a note is found that says he left in shame, claiming he was caught taking bribes. Not believing the note is real, Roy starts an investigation and soon discovers that his disappearance coincides with a Mineral City banker trying to get the town to legalize gambling, and works with Dale and the sheriff's wife to clear his name.