A rather trite little mystery-western sees the ten year old Henry twins, Betty and Bob, discover gold while at their friends the Porters' ranch near Phoenix, Arizona. On arrival, the kids learn the legend of the Lost Dutchman gold mine in the nearby Superstition Mountains and with Indian Joe, a trustworthy Pima Indian ranch hand, they set out to see what they can find. Though the take isn't big money, adventures with rustlers and sickness provide an emergency relief for the more ordinary facts about life in the west.