Book excerpt: This timely work examines the scale and root causes of terrorism across Southeast Asia, including the role of al-Qaeda's ascendancy in the region. It begins with an overview of the analytical and theoretical framework for discussing the subject. Individual chapters then examine terrorist activities from both functional and country-specific perspectives. The book traces fundamental linkages between terrorism and security issues, such as illegal immigration, narcotics trafficking, and other criminal activity. In addition, it considers the issue of convergence - the growing connection between criminal groups and terrorism, and how this may facilitate future violence. Written by a range of experts in the field, the individual chapters reflect a variety of perspectives. The contributions fall into two broad categories - chapters that directly address terrorism (the groups, their ideologies, their modus operandi, their origins, and state responses to them); and chapters that address the "enabling environment" that exists in Southeast Asia (the role of transnational crime, porous borders, convergence between terrorism and crime).