A man awaiting execution records his final hours, grappling with the psychological disintegration caused by the looming certainty of his death. The protagonist, whose name remains unstated, occupies his final days in a prison cell, documenting his observations and memories as he faces the guillotine. He struggles against the cold indifference of the legal system and the physical confinement of his environment. The narrative framework is a first-person account, functioning as a raw, immediate confession that emphasizes the internal experience of the condemned over the external details of his crime.

Readers and critics frequently highlight the visceral impact of the text, noting how it functions as a powerful polemic against state-sanctioned violence. Discussion often centers on the author's ability to evoke empathy for a character who has committed a grave crime, shifting the focus from the act itself to the humanity of the individual. The pacing is described as relentless and claustrophobic, mirroring the protagonist's own narrowing perspective as his time runs out. Many observers point to the work as a foundational text in the history of human rights literature, praising its enduring relevance in contemporary debates regarding justice and mercy.