Book excerpt: The nexus between terrorism and organised crime consists of a strategic alliance between two non-state actors who are able to exploit illegal markets, threaten the security of individuals, and influence policy-making on a global level. Recent Europol reports have pointed towards the importance of studying the links between organised crime and terrorist groups, and have underlined that the nature and extent of these connections have seldom been addressed from an academic perspective. Considering the danger that both organised crime and terrorism currently pose to the world, the collusion between these two phenomena is of urgent contemporary interest. Basing itself on geographical case-studies, this book contributes to the existing literature in three ways: by enriching the empirical knowledge on the nature of the crime-terror nexus and its evolution; by exploring the impact of the nexus within different economic, political and societal contexts; and by expanding on its theoretical conceptualization. This book was originally published as a special issue of Global Crime.