Through the crater's rim

In Short

A nameless narrator and adventurer sets out to investigate a mysterious stone city spotted from the air atop an isolated mountain in the unexplored jungles of Darien, Panama. Fleeing hostile Kuna warriors and carnivorous, tentacled trees, he stumbles into a sunken volcanic crater where a dwarfed, reverse-walking race of people sacrifices victims to the sun god. After surviving captivity, a dramatic plane rescue by his aviator friend Hazen leads to the catastrophic destruction of the lost city when a stray bomb shatters the local aqueduct, flooding the valley and wiping the civilization from existence.

The Story

Lieutenant Hazen startles his companions at a Colon hotel by reporting a stone city of a thousand houses atop a flat-topped mountain in Darien, visible only from his reconnaissance plane. Intrigued by the risk, the narrator organizes an expedition, hiring two native men, José and Carlos, to navigate the Cañazas River into Kuna territory. Shortly after breaking camp, arrows strike the party; José falls, and the narrator and Carlos flee in terror from pursuing Kunas. Breaking through the jungle, they reach the base of a lofty mountain where giant trees with flexible, thorn-armed tentacles writhe and attack. Carlos is nearly caught by a vegetative monster, but the narrator escapes into a narrow rocky defile that leads straight into the lost city.

Inside the circular crater, the narrator discovers hundreds of flat-roofed stone buildings swarming with peculiar, ugly people who walk and run entirely on their hands with their feet in the air. Capturing the attention of the inhabitants, he wins a brief, terrified compliance by giving their leader a pocket mirror. Escorted to the king and his green-clad courtiers, the narrator demonstrates his "magic" by smoking a pipe, which terrifies the monarch. Exploring further, he discovers a massive sacrificial pyramid with an Aztec-style altar and a quarry filled with platinum-iridium tools that easily slice the soft, wax-like stone of the region. He also notes a stone aqueduct carrying water from a mountain reservoir directly into the city.

Trouble looms when the narrator's coat—containing his remaining matches and tobacco—is stolen while he sleeps. A native informant reveals to the high priest that the narrator entered via the tunnel rather than dropping from the sky, sealing his doom. Arrested and thrown into a dark cell, the narrator is eventually dragged to the summit of the pyramid for a dawn sacrifice. Bound to the blood-stained stone, he awaits the fatal obsidian knife blow from the priest, which custom dictates must wait until the rising sun strikes the victim's chest. Hazen’s airplane suddenly roars overhead. Hazen swoops low, frightening the populace and causing the priest to drop his knife. Hazen lands near the pyramid, dashes up the stairs, hurls the priest from the summit, and cuts the narrator's bonds. As the two men scramble toward the plane and take off, a bomb drops from the aircraft into the quarry, shattering the aqueduct and unleashing a massive flood from the crater lake. The rising waters consume the city, while a downstream torrent of water bursts through the tunnel and sweeps away the man-eating trees. Escaping northward, the narrator leaves the lost city buried beneath a silvery lake.

How It Unfolds

• The voyage begins: The narrator travels up the Cañazas River past the last outposts of civilization with two reluctant native guides into forbidden Kuna territory.
• Flight from the jungle: Ambushed by Kuna warriors, the narrator and Carlos flee through the dense undergrowth and barely escape monstrous, tentacled trees that attack with grasping vines.
• The lost city revealed: Escaping through a rocky cleft, the narrator enters a volcanic crater containing a stone city populated by dwarfed people who walk on their hands.
• Audience with the king: The narrator gains the tentative trust of the inhabitants and their king by demonstrating his pipe and gifting a pocket mirror.
• The pyramid and the quarry: Exploration of the city reveals a gruesome sacrificial pyramid and stone-cutters using heavy platinum-iridium tools on soft, unexposed rock.
• The rescue and the flood: Bound to the altar for a morning sacrifice, the narrator is saved at the last second by Hazen's airplane, while a detonated bomb destroys the aqueduct and floods the entire valley.

The People

• The Narrator: An intrepid explorer driven by curiosity and a love of danger who seeks out the unknown in Darien. He relies on quick thinking, a pipe, a mirror, and a pistol to navigate hostile encounters, ultimately escaping with a rich scientific record of his harrowing ordeal.
• Lieutenant Hazen: An observant aviator who first sights the lost city from his airplane. Cheerful, loyal, and bold, he successfully executes a daring rescue flight that saves the narrator from the sacrificial altar.
• The King: The supreme ruler of the crater city, distinguished from his subjects by his ability to walk upright on his feet. Cautious and easily intimidated by the narrator's fire-eating tricks, he presides over a rigidly stratified society.
• The High Priest: A severe, traditionalist religious leader who strictly adheres to Aztec sacrificial customs. He views the narrator as a false deity, subjects him to physical abuse, and attempts to tear out his heart before being hurled to his death.
• Carlos: A fearful native guide who panics and flees during the Kuna ambush, narrowly surviving a brush with the man-eating trees.
• Zip: A local guide and valet who accompanies the narrator through the city and aids his exploration before the final betrayal.

In Its Own Voice

“It was rotten air,” Hazen explained in reply to my question.

The aviator describes the difficult atmospheric conditions that prevented him from bringing his reconnaissance plane lower than five thousand feet above the mysterious mountain city.

The forest was approaching me!

The narrator experiences a moment of sheer disbelief and horror upon realizing that the jungle trees surrounding him are actually mobile, tentacled plant monsters.

The metal was an alloy of platinum and iridium—the later one of the hardest of all known metals.

The narrator reflects on the surprising scientific composition of the heavy, steel-colored cutting tools used by the stone-cutters in the crater.

What It's Really About

The story explores the tension between modern scientific inquiry and primordial terror, using the conventions of lost-race fiction to examine human resilience. It asks what remains of civilization when isolated from the rest of the world for centuries, and how societies construct elaborate belief systems around fear and geography. The narrative also highlights the disruptive impact of modern technology—airplanes, matches, and high explosives—upon ancient ecosystems and insular cultures, treating exploration as both a triumph of intellect and a catalyst for unintended destruction.

Why Read It Today

Readers who love classic pulp adventure, lost-world exploration, and briskly paced scientifiction will find plenty to enjoy here. Reading it feels like flipping through the pages of an early-century adventure magazine, filled with vivid, high-stakes peril and exotic discoveries. However, modern readers must contend with period attitudes, including ethnocentric portrayals of indigenous peoples and the crude caricature of the inhabitants as repulsive, dwarfed figures. The prose leans heavily on melodramatic turns of phrase, and the plot moves swiftly past scientific plausibility in favor of sensational action. Yet, the sheer momentum of the narrative—from jungle ambushes and vegetable monsters to a climactic aerial rescue and a cataclysmic flood—keeps the pages turning. What stays with you long after finishing is the uncanny image of the hand-walking citizens and the terrifying finality of the crater lake swallowing an entire civilization in a matter of minutes.

What other lost-world or early science fiction tropes interest you most?