In this pithy and highly readable book, Brian Skyrms, a recognized authority on game theory and decision theory, investigates traditional problems of the social contract in terms of evolutionary dynamics. Game theory is skillfully employed to offer quite new interpretations of a wide variety of social phenomena, including justice, mutual aid, commitment, convention, and meaning. The author eschews any grand, unified theory. Rather, he presents the reader with tools drawn from evolutionary game theory for the purpose of analyzing and coming to understand the social contract. The book is not technical and requires no special background knowledge. As such, it could be enjoyed by students and professionals in a wide range of disciplines: political science, philosophy, decision theory, economics and biology.