John Carmody arrives on the planet Dante's Joy during a rare celestial event that forces the subconscious desires of every inhabitant to manifest in physical reality. Carmody, a man seeking redemption for his past, must navigate a world where the boundary between thought and matter dissolves. As the planet's unique atmosphere triggers these manifestations, he faces both external threats from the environment and internal conflicts regarding his own morality. The narrative follows his attempt to survive the night while confronting the literal projections of his own psyche and those of the people around him. The story utilizes a third-person perspective to examine the psychological consequences of a world where hidden impulses gain agency.

Readers frequently highlight the imaginative scope of the planet's unique environment and the surreal nature of the manifestations. Discussion often centers on the philosophical questions Farmer poses regarding the relationship between human desire and objective reality. Critics often note the intensity of the prose, which mirrors the chaotic and unpredictable events occurring on Dante's Joy. The balance between character-driven introspection and the bizarre external events remains a frequent point of analysis for those interested in mid-century speculative fiction. Many readers appreciate how the narrative maintains a sense of unease throughout the duration of the night.