Siddartha Kara, "Sex Trafficking: Inside The Business of Modern Slavery," (Columbia University Press, 2009)
Really compelling but slow read; this book basically attempts to analyze the business of human trafficking (not just sex slaves, either) from an economic as well as social perspective - nice to get a holistic perspective on the issue without total reliance on tragic victim testimonials, etc. More so, the journalistic approach is equally as rigorous as the more essay-like, data-driven sections; the guy actually went around to all these places risking his own life to help or at least talk to some of these people, mostly women. Great read for anyone interested in humanitarian or abjectly bleak subject matter.