"This book unequivocally demonstrates the theoretical and empirical utility of role theory for IR while at the same time providing new insights into British foreign policy in the 1930s. Walker’s mix of historical narrative and formal analysis is unexcelled. All those concerned with agents and structures will find this book enlightening and refreshing—a must read."—John Vasquez, University of Illinois at Urbana-Champaign"Observers of world politics have long agreed that Britain's decisions to appease Imperial Japan, Mussolini's Italy and Hitler's Germany contributed to the outbreak of World War II, but they have proposed varying explanations for those decisions. Drawing upon both archival evidence and mathematical analysis, Stephen Walker's path-breaking new book develops a compelling case for role theory as a general analytic solution to ‘the appeasement puzzle.’ His conclusion indicates that leaders’ beliefs and preferences provide a powerful explanation for how and why foreign policy decisions are made."—Ole R. Holsti, Duke University