During the California gold rush, four unsuccessful miners assume that a woman prospector will give in without a fight, so they jump the claim of Kate Kenner and take her gold away from her. Afterward, although she is Sheriff Dan Deering's sweetheart, Kate decides to take the law into her own hands. Donning the trademark black mask of Silver Spurs, the noted bandit, Kate holds up the saloon where the crooks have stored the gold. As she makes her getaway, however, Dan catches her, and after unmasking her, is astonished to discover Silver Spur's true identity. The town puts Kate on trial immediately and a guilty verdict seems assured until the real Silver Spurs, who had greatly admired the masquerade, himself steals the gold and leaves a note exonerating Kate. Then, taking time out from his sheriff's duty, Dan, instead of pursuing Silver Spurs, starts making plans with Kate for their wedding.