The story in one page
Jerry, Ned, and Bob drive their touring car across the Rio Grande, trading the paved roads of the United States for the dense forests and vast plains of Mexico. They are accompanying Professor Snodgrass, a naturalist who cares more for tree-toads and gila monsters than his own safety. While the boys manage the gasoline stove and navigate fallen trees, their old enemy Noddy Nixon follows close behind, convinced they are heading toward a gold mine. The journey involves dodging brigands, surviving a midnight camp raid, and eventually uncovering a hidden underground civilization where they must rescue a local girl and secure ancient curios before heading home.
Who's who
- Jerry
One of the three motor boys and a primary driver.
- Professor Snodgrass
An eccentric naturalist obsessed with collecting rare bugs and reptiles.
- Noddy Nixon
A recurring antagonist who plots to steal the boys' findings.
- Maximina
A girl rescued by the boys from a ruined temple.
- Vasco
A member of Noddy's party who monitors the surly crew.
What it's really about
- Technological Superiority
- Using modern automobiles to conquer untamed and ancient landscapes.
- Academic Obsession
- The professor prioritizes specimen collection over personal safety.
Why it's memorable
- Professor Snodgrass pulling a gila monster out of a hole by its tail.
- The boys cooking canned chicken and frijoles on a portable gasoline stove.
The ending, explained
Spoilers — show the ending
After rescuing Maximina and delivering her to relatives in Mexico City, the boys repair their car and drive back to the United States while the professor plans a four-volume work on his discoveries.
For your book club
- The contrast between the boys' automotive technology and the ancient ruins they explore.
- Noddy Nixon’s failure to lead his disgruntled Mexican hired hands effectively.