Bob Steele #5

When smuggled cattle bearing forged brands flood the market at ruinously low prices, Bob Steele must cross the border to uncover how the illegal herd is slipping through—and who's behind the scheme that threatens to bankrupt every rancher in the territory. With the region's livelihood on the line, Steele follows a dangerous trail that leads deeper into the mystery of the contraband operation.

When a band of ruthless outlaws led by the jailed criminal Bull Kenner kidnaps the territory's only doctor as leverage for a gold heist, Bob Steele tracks them to a hidden underground city—where a deadly ancient weapon and suffocating trap force him to think fast to survive. With a sick boy back in town depending on the doctor's surgery, Bob has no choice but to outwit both the outlaws and the strange civilization they've discovered to save them both.

Dimwit Diddle wonders if a tunnel ahead is wide enough for his wagon to pass through, only to discover it's not going to work out the way he hoped. This short, offbeat tale captures the kind of frontier folly you'd expect from a character whose name says it all.