The quiet suburban town of Hampstead faces a dual annihilation as a man-made chemical disaster converges with an ancient, malevolent supernatural force. As the townspeople struggle to comprehend the encroaching chemical cloud, they find themselves hunted by a predatory entity that defies physical laws. The narrative shifts between multiple perspectives, documenting the breakdown of social order and the desperate attempts of residents to survive both the tangible and intangible threats. The story utilizes a multi-layered structure to contrast the cold, mechanical reality of human error against the chaotic, irrational nature of the supernatural horror.

Critics have long noted the ambitious scope of this novel, often highlighting the author's ability to weave disparate threads of horror into a cohesive, nightmarish vision. The work is frequently cited for its technical proficiency in managing multiple plot lines while maintaining a consistent sense of dread. Readers often respond to the stark contrast between the grounded, realistic threat of the chemical spill and the surreal, otherworldly nature of the antagonist. The novel remains a significant entry in the author's bibliography, illustrating a commitment to pushing the boundaries of the genre through complex narrative construction and intense, atmospheric world-building.