A technological experiment involving the reconstruction of ancient remains results in a consciousness swap between a modern teenager and a Neanderthal. The protagonist, a young man caught in the aftermath of his father's archaeological ambition, must navigate the cognitive and physical realities of a prehistoric existence while his Neanderthal counterpart experiences the complexities of the future. The narrative explores the friction between disparate evolutionary stages, utilizing a dual-perspective framework to contrast the survival-driven instincts of the past with the technological saturation of the near future.

Discussion often centers on the technical execution of the mind-swap premise and how effectively the author portrays the internal experience of a Neanderthal. Readers frequently highlight the contrast between the sterile, high-tech environment of the archaeology lab and the visceral, sensory-heavy world of the prehistoric past. The pacing is noted for its focus on character adaptation rather than purely action-oriented sequences. Critics often point to the book's ability to maintain a consistent tone while shifting between two vastly different temporal and biological contexts.