In a regressive, superstitious England where technology is outlawed and branded as witchcraft, four children risk their lives to rescue a man condemned for his mechanical knowledge. The protagonists navigate a landscape defined by fear and the collapse of modern infrastructure, where the remnants of the past are treated with religious terror. Their objective is to smuggle the injured man to safety, a task that forces them to confront the brutal social order imposed by the local authorities. The narrative follows their perilous movement across a rural, isolationist countryside, highlighting the tension between the children's curiosity and the rigid, anti-intellectual dogma of their community.

This work is recognized for its imaginative approach to a world where the clock has been turned back on human progress. The narrative style is noted for its ability to maintain suspense while exploring the sociological implications of a society that has rejected its own history. Readers often point to the stark contrast between the children's innocence and the harsh, unforgiving nature of the world they inhabit. The book remains a significant entry in the genre for its thoughtful examination of how fear can be used to control a population. Its enduring presence in literature suggests a lasting interest in the fragility of civilization and the resilience of the human spirit.