The story begins in the English town of Woking, where the narrator and his friend Ogilvy witness unusual "jets of gas" firing from Mars. This curiosity quickly turns to dread when a "long metal cylinder" crashes into a nearby park. As the crowd gathers, the cylinder unscrews, revealing "tentacles" and a creature with "large eyes." The initial wonder is shattered when a "rod-shaped machine" emerges, emitting an "invisible heat ray" that vaporizes Ogilvy, turning the scene into a landscape of "horror."
As more "Martian cylinders streak across the sky," the narrator realizes his home is within range of the destruction. He observes "enormous tripods"—machines with three legs—that move through the landscape, pushing through trees "as if they were grass." The military attempts to defend humanity, but their efforts are futile; the tripods "fight fire with fire," destroying entire bases with ease. The narrator’s desperate flight leads him to seek shelter, while his brother in London navigates the "panic" of mass evacuation, eventually escaping on a ship after a naval vessel heroically sacrifices itself to destroy the advancing machines.
Seeking refuge in a house, the narrator finds himself "out of the frying pan and into the fire" when another spacecraft crashes directly into his hiding spot. Trapped alongside a curate, the narrator is forced to witness the "gruesome treatment of a human captive" by the Martians. The curate, overwhelmed by the "end of days," begins yelling, forcing the narrator to knock him out to avoid detection. Despite his efforts, the Martians discover the curate, dragging him away with a "metal tentacle," leaving the narrator to hide in a "coal cellar" for days, "terrified and hungry."
When the narrator finally emerges, he discovers the Martians have vanished. Their defeat was not the result of human ingenuity or military might, but rather "bacteria." Because the Martians had "no microbes on their planet," they possessed no "immunity to Earth's diseases" and perished from illness. The story concludes with the narrator reuniting with his wife in Woking, reflecting on the realization that humanity must "find unity" to survive future threats. H.G. Wells’ classic serves as a testament to his imaginative power, showing an invasion that was truly "out of this world."