The three books reviewed here all address the question of the efficacy of international law and advance concerns about its future trajectory, albeit in contrasting ways. As has been well documented, the role of international law – specifically in the regulation of the use of force – has undergone significant scrutiny in the post-Cold War era. To a much greater extent than during the Cold War, contemporary conflicts and crises are invariably discussed with reference to international law, and the legality of a particular use of force has become a significant factor in assessing its legitimacy; one need only think of the importance placed on the legality of the 2003 invasion of Iraq. This increase in prominence suggests that international law has become more important, and unsurprisingly those used to the discipline's previous role as exotic curio have welcomed this sudden promotion (Robertson, 2000).