In the Walls of Eryx

by H. P. Lovecraft

The story, written in prospector on the planet Venus who, while working for a mining company, becomes trapped in an invisible maze.

The story takes place in the future, when humanity has developed space travel and begun to explore Venus. There, they discover valuable crystal orbs that can be used as a source of electrical power, as well as a race of primitive lizardmen who guard the crystals fervently and who attack any humans who try to take them.

The narrator, Kenton J. Stanfield, is one of many explorers employed to collect the crystals. He is equipped with a breathing apparatus fueled by oxygen cubes (as Venus' atmosphere cannot sustain human life) and has a leather protective suit, as well as a "flame pistol" to use against lizardmen.

While on a routine mission, the narrator encounters a bizarre structure: a maze whose walls are completely invisible, inside of which is a crystal of unusually large size. The prize is held by a dead prospector. The protagonist, feeling confident he can map out the maze, makes his way to the center after collecting the crystal in order to explore the structure. However, he soon discovers that he has misjudged the maze, and is unable to relocate the entrance point.

Trapped in the maze, the narrator's oxygen and water supply steadily begins to run out, and lizardmen soon begin to gather at the outside of the maze to observe and mock him. Realizing the futility of his situation, the narrator begins to grasp the religious significance of the crystals to the lizardmen, and also realizes that the maze's nature as a constructed structure, and as a trap, indicates that the lizardmen are actually more intelligent than the humans are willing to admit. In time he realizes that he will face the same fate as the preceding prospector.

Dying, the narrator writes down his observations on a futuristic form of recording paper. He describes how in his last moments he has developed a feeling of kinship with the lizardmen, and pleads with his superiors to leave Venus, the lizardmen, and the crystals alone, as they hold mysteries humanity cannot begin to grasp, and mankind does not really need to exploit them.

The narrator's testimony, along with his body, are soon recovered by a search party, who discover an additional exit just behind the ground where Stanfield died, which the prospector missed when attempting to map out the maze. However, his dying pleas for humanity to leave Venus alone are dismissed by his employers as unfortunate dementia caused by his desperate situation, and instead the crystal mining company decides to use draconian measures to annihilate the lizardmen completely.