The story can roughly be divided into three parts - as it spans four letters: 1) Letter XI illustrates the Troglodytes living by their desires, 2) Letters XII and XII focus on the Troglodytes living by virtues, and 3) Letter XIV demonstrates the Troglodytes difficulty in forming a government.
The story as a whole is a fable, with Montesquieu pointing out in the first part that men should not live by their desire. The Troglodytes are depicted as humans decedent from animals, and "were so wicked and so ferocious that there existed among them no principle of equity and justice." They were once ruled by a king who sought to abandon them of their wicked ways, but they soon killed him off, denouncing all government, and living by selfish whims. They soon fall prey to what Hobbes and Locke describe as a state of nature, where basically only the strongest survived. And through their "cupidity" they soon all fall prey to each other in one way or another: wives are stolen, as well as land, and material possessions. Even ties to neighboring countries are cut off; when a mysterious illness plagues their lands a foreign doctor arrives and cures them, but is refused payment or retribution for his services, and when the illness strikes again the doctor declines their requests for help based on their previous behavior towards him. And Montesquieu concludes the fate of the Troglodytes that live in a world of desire, by describing them as