A spaceship lands on a seemingly lifeless planet, L216^{12}, which is later seeded with microorganisms and plants. Centuries later, an ecological ship returns to find a thriving ecosystem, but the planet is forgotten for centuries. The descendants of a human shipwrecked there, the _Icarus_, have devolved into a primitive state, living in fear of monstrous insects and fungi. They have lost all knowledge of their origins and live in constant danger from the planet's deadly fauna. Burl, one of the humans, begins to exhibit signs of intelligence and leadership after a series of harrowing encounters with the planet's predators, particularly a giant hunting spider and its offspring. As the group faces imminent extinction, Burl's instincts drive him to confront the dangers, leading to a pivotal moment where he kills a spider, gaining the admiration of his fellow survivors. As they flee their valley, Burl leads the group upward into the mountains, where they discover a temperate plateau above the clouds. Here, they encounter a new world filled with sunlight, clean air, and smaller, non-threatening creatures. The humans begin to adapt, forming a new society with the help of dogs that have survived from the original shipwreck. The dogs become companions and allies, assisting in hunting and providing protection. Burl's leadership solidifies as he guides the group in their new environment, fostering a sense of community and cooperation. They learn to hunt and gather food, transitioning from a life of fear to one of exploration and discovery. The humans and dogs form a symbiotic relationship, enhancing their survival and quality of life. Eventually, a spaceship from a nearby planet arrives, seeking to reconnect with the lost humans. Burl and his tribe are introduced to advanced technology and education, allowing them to reclaim their heritage and knowledge. They adapt to this new civilization while maintaining their unique identity, becoming skilled hunters and respected members of a broader interstellar community. The narrative concludes with Burl and his tribe thriving in their new world, having transformed from primitive survivors into a society that embraces both their past and the future, exemplifying resilience and adaptability in the face of overwhelming odds.
By Murray Leinster · First published 1957 · Genre: Science Fiction, Adventure, Fantasy