'This is an impressive volume in its scope and its ability to capture nuance in a relationship that is often subject to generalisations and simplified analysis. Wastnidge and Mabon have assembled a solid group of scholars who have managed to make an important and original contribution to a topic that has lately been studied a great deal. I strongly recommend this book for anyone interested in a serious understanding of the complex relationship between Saudi Arabia and Iran.'Mehran Kamrava, Professor of Government, Georgetown University Qatar‘Not only does this volume provide a fascinating account of how the Saudi-Iranian rivalry has played out across time and space and impacted regional and domestic politics across the Middle East. It also shows how a stronger dialogue between IR theory and Middle East studies can offer insights into Middle East politics that go beyond the well-known politics v. piety debate.’Morten Valbjørn, Associate Professor, Department of Political Science, Aarhus University