This book investigates the evolutionary mechanisms that allowed for the emergence of complex human language, specifically focusing on the transition from simple communication to the structured syntax of sentences. Andrew Carstairs-McCarthy, a noted linguist, synthesizes data from archaeology, cognitive science, and evolutionary biology to argue that language is not merely a byproduct of general intelligence. He proposes a distinct evolutionary trajectory that accounts for human uniqueness in linguistic capability compared to other species.

Scholars and students of linguistics frequently cite this work for its provocative challenge to standard evolutionary models. The text is noted for its interdisciplinary approach, making it a significant reference for those examining the biological foundations of human speech.