This book unpacks the contemporary security challenges in Nigeria. Instead of a monolithic analysis of Boko-Haram, it discusses other armed groups, secessionist agitations, maritime security, the social context of insecurity, the nexus between the proliferation of small arms and light weapons and insecurity, the mental health outcomes of insecurity, substance abuse and security, as well as migration and national security. The book is a policy-driven research work that speaks directly to policymakers, students, and other important stakeholders in the security sector in Nigeria and beyond.