An extraterrestrial force descends upon Victorian England, initiating a catastrophic struggle for human survival against technologically superior invaders. The protagonist, an unnamed writer, attempts to navigate the chaos of the Martian invasion while searching for his wife amidst the collapse of social order. He faces the physical threat of heat-rays and toxic black smoke, alongside the logical breakdown of military and governmental structures. The narrative is presented as a retrospective first-person account, documenting the rapid disintegration of civilization under the weight of an unstoppable alien offensive.

Readers frequently highlight the effectiveness of the novel's atmosphere, which captures the dread of an unknown threat with clinical precision. Discussion often centers on the author's critique of colonial expansion, as the invaders mirror the very tactics used by the British Empire. Critics often note the balance between the protagonist's internal psychological state and the external, large-scale action sequences. The narrative remains a foundational text for the alien invasion subgenre, consistently analyzed for its influence on modern speculative fiction.