When U.S. Deputy Marshall Bat Carson is summoned to the town of Sonora to investigate the robberies of gold shipments from the nearby mine, he meets and falls in love with Phyllis Harland. At the mine office, Bat soon discovers that Phyllis' brother Phil is leaking information of the shipments through his dance hall girlfriend, Fay La Cross. Upon further investigation, Bat learns that the master minds in the operation are saloon owner Con Norton and Sheriff Jim Canby. After Bat arrests Phil for his role in the robberies, Fay, since spurned by Norton, agrees to testify against him in court. On the day of the trial, Norton kidnaps Fay and Bat follows in pursuit. After a thrilling chase, Bat rescues her and races back to court to win both Phil's freedom and Phyllis' hand in marriage.