Written by legal philosopher H.L.A. Hart, 'The Concept of Law' is a seminal work on the nature of law and its role in society. Hart explores the relationship between law and morality, arguing that while they are distinct concepts, they are interconnected in complex ways. He examines the concept of legal obligation, the role of judges in interpreting the law, and the limits of state power. This influential book provides a comprehensive analysis of the ethical and legal dimensions of civil liberties and remains a cornerstone of legal philosophy.