The drug trade. Crime. Terrorism. Cyber threats. In the Caribbean, these cross-border Problems Without Passports (PWPs) have shaken the very foundation of nation states. Blending case studies with regional analysis, Ivelaw Lloyd Griffith examines the regionwide impact of PWPs and the complex security and sovereignty issues in play. The interaction of local and global forces within PWPs undermines the governments’ basic goal of protecting their people against military threats, subversion, and the erosion of political, economic, and social values. Seeking solutions to these multidimensional threats requires addressing both traditional and non-traditional security and sovereignty issues. Griffith focuses on clashes between PWPs and the state from warring drug gangs in Jamaica, to Trinidad and Tobago’s one-time status as a center for terrorism-related activities, to the political resurgence of drug trafficker Desi Bouterse in Suriname, and the growing cyber threats across the region. Informed and up to date, Challenged Sovereignty explains the effects of today’s globalized problems on the contemporary Caribbean.