"A thought provoking look at both current and future thinking in security and IR." LSE Review of Books "In this concise and readable overview, Roland Dannreuther redefines the range and scope of the 'new' threats undermining international security. He does so by skilfully interweaving theoretical approaches inspired by constructivism, and empirical evidence from a wide range of contemporary sources of instability. The book sets a very high standard of scholarship which others must now strive to emulate." Jolyon Howorth, Yale University "Roland Dannreuther provides a sensitive and analytically strong account of the intellectual dilemmas faced by security studies in the new environment of threat in the post-Cold War era. This book delivers an impressive account of the new and challenging issues faced by both academics and practitioners in the area of security and a balanced account of the continuing debates within the subdiscipline. S. Neil MacFarlane, University of Oxford "Dannreuther clarifies and advances critical debates even as he provides an unmatched tour d'horizon. He treats often arcane material critically, fairly and insightfully, conveying his arguments in straightforward and effective prose. This is a timely and extremely useful book." William C. Wohlforth, Dartmouth College, New Hampshire "Students seeking a sensible guide through the maze of today's security challenges will welcome this book for its clear integration of theoretical analysis with key contemporary issues." Paul D. Williams, George Washington University