More relevant now than when it was first published, the essays resonate against the historical turn, the practice turn, and the agent-structure conundrum. Diplomatic Investigations has seen off systems theory, decision-making analysis, and rational choice and is the foundation of contemporary international political theory. Hall and Dunne conduct a notable tour d'horizon of the essays. * Cornelia Navari, Visiting Professor of International Affairs, University of Buckingham * At a critical, disquieting, disorienting moment in international politics, Tim Dunne and Ian Hall remind us of the ambitiousness of the debates that marked the apogee of British IR and 'diplomatic investigations'. Framed by a thoughtful introductory recontextualization of the original volume, this re-issued classic will help anchor the thinking of a new generation of students of the world order. * Glenda Sluga, Professor of International History and ARC Kathleen Fitzpatrick Laureate Fellow, University of Sydney * Diplomatic Investigations has long been a rare book: hard to obtain, precious in content, yet distinctive for its enduring relevance and growing impact. As the Urtext of the 'English School' of international relations, it has long been an indispensable resource and an essential point of reference. Now armed with a richly illuminating introduction, the timely reissue of this classic collection will find new readers and inspire novel debates. * David Armitage, Lloyd C. Blankfein Professor of History, Harvard University *