Bret and Bart inherit a stagecoach line from their uncle, discover that it's only of value to a local rancher, and try to sell it to her for 49% of the profit for the rest of their lives. But the rancher, a stagecoach robber, a greedy lawyer, and his hired killer have other plans.

A beautiful dance hall girl, Flo Baker, leaves an innocent Beau Maverick to face a murder charge. Shortly after Beau wins half ownership of a gambling casino in St. Joe. Mo. Flo, in self defense, shoots and kills his partner. The dead man's brother, Luke Storm, accuses Beau of the murder, hoping to inherit Maverick's share in the casino. Beau flees St. Joe in search of the missing Flo. He finds her in a New Mexico hamlet where she is adored as the town's first school teacher. The citizens are unaware of Flo's dance hall background. Flo likes her new life and is reluctant to admit her guilt in the murder. She is faced with a cruel decision when Luke shows up with plans to kill the innocent Beau.

Beau & Bart fight to escape a black hole - where money and people enter, but can't leave! The cousins have to sleep sitting up in Stop Gap's only watering hole, after saving from robbers the treacherous Wembly, who promised them free, comfy hotel beds - but knew the inn was full-up. Wembly's suspiciously tight with the mining town's telegraph owner, son of a Colorado Senator. Why is the town too small to have a bank, as its population and wealth mysteriously expand to infinity - and beyond?