With the cyclotram, an atomic-powered rock-boring vehicle, Dr. Jerimiah Morley leads an expedition into a subterranean world.

A gold mine in Arizona, that was formerly losing a lot of money, suddenly turns into a veritable money-making machine. However, the owner, instead of being happy about his now profitable business, insists to Charlie that something is fishy and that someone is out to murder him. Charlie and his "crew" travel to the mine, pretending to be tourists staying at a nearby dude ranch so as not to arouse suspicion, and discover that the owner may well be right--it looks like the mine is being used as a cover for criminal activities, and that someone is indeed out to murder him.

In San Francisco's Chinatown, Charlie helps two different people search for their missing relatives and uncovers a murder for insurance scheme.

Deerslayer, a white man who was brought up by the Mohicans, helps his old tribe when the Hurons steal Princess Wah Tah, the betrothed of his friend Jingo-Good. His friends, the Hutters, are a white family living on an ark in the middle of a lake. The Hurons attack them and Deerslayer enlists the aid of scout Harry March, who is escorting sixty-five brides to the near-by settlement. Deerslayer and Harry are both in love with Judith Hutter, who is secretly in love with Harry. The Hurons succeed in capturing her father and Harry, where-upon Judith's sister Hetty, playing on an Indian superstition never to harm an insane person, feigns madness and makes an escape. Hutter, Judith, Hetty and Princess Wah-Tah return to the ark, where they ate attacked by the waiting Hurons and Hetty is killed. Deerslayer, Harry and the settlement men arrive to time to drive the Hurons away.