When Marie Laurent discovers that her employer, Professor Kern, is keeping the severed head of the brilliant Professor Dowell alive, she becomes trapped in a dangerous moral conflict. Marie must navigate the ethical vacuum of Kern's laboratory while attempting to protect the disembodied Dowell from further exploitation. As she forms a bond with the head, she faces the physical constraints of the laboratory and the logical impossibility of Dowell's continued existence. The narrative unfolds through a tense, focused perspective that highlights the power imbalance between the scientist and his subject.

Readers frequently highlight the novel's early exploration of transhumanist themes and the macabre nature of its central premise. Discussion often centers on the ethical implications of scientific advancement when stripped of human empathy. Critics note that the pacing effectively builds suspense as the protagonist uncovers the full extent of the laboratory's illicit activities. The work is often compared to other classic science fiction that questions the boundaries of life and death. Many readers appreciate how the narrative maintains a clinical focus while addressing profound questions about identity and autonomy.