A single Allied bombing raid over Germany in 1943 serves as the catalyst for a sprawling, multi-perspective examination of the human cost of aerial warfare. The narrative tracks the crew of a Wellington bomber, the German civilians in the target city, and the military personnel on both sides of the conflict over the course of twenty-four hours. Deighton employs a documentary-style framework, alternating between technical precision and the intimate, often harrowing experiences of those caught in the machinery of war. The story forces the reader to confront the logistical reality of the air campaign while navigating the moral ambiguity inherent in the destruction of an urban center.

This novel is widely regarded as a significant achievement in the genre of war fiction for its unflinching commitment to realism and technical detail. Critics have frequently noted the effectiveness of Deighton's documentary approach in humanizing the participants on both sides of the conflict. The narrative is often praised for its ability to balance the cold mechanics of aerial warfare with the visceral experiences of the individuals involved. Readers and reviewers alike have highlighted the book's capacity to evoke the tension and tragedy of the 1943 air raids without resorting to sentimentality.