Book synopsis: Ethics and international Relations (IR), once considered along the margins of the IR field, has emerged as one of the most eclectic and interdisciplinary research areas today. Yet the same diversity that enriches this field also makes it a difficult one to characterize. Is it, or should it only be, the social-scientific pursuit of explaining and understanding how ethics influences the behaviours of actors in international relations? Or, should it be a field characterized by what the world should be like, based on philosophical, normative and policy-based arguments? This Handbook suggests that it can actually be both, as the contributions contained therein demonstrate how those two conceptions of ethics and international relat...