"David Smith's On The Edge of Freedom is the most nuanced, detailed and sophisticated study of the Underground Railroad in rural Pennsylvania that I have ever read. Based on a wide variety of primary sources, this study offers a series of fresh insights about how the fugitive crisis along the Mason-Dixon Line directly impacted the wider national struggle over slavery and union." -- Matthew Pinkser, Dickinson College. David G. Smith has delivered a revelatory portrait of one of the most important political battlegrounds of antebellum America, where networks of fugitive slaves, slave-catchers, informers, and Underground Railroad activists lived side by side in a tangled web. He sheds much new light on the struggle of the abolitionism to take route in southern Pennsylvania's difficult soil, and challenges cherished preconceptions of the North as solidly anti-slavery and friendly to fugitive slaves. In the process, he has given us a deeper understanding of the daunting moral complexities of life in the pre-Civil War borderland. This is a book to be reckoned with."-Fergus M. Bordewich, author of America"s Great debate: Henry Clay, Stephen A. Douglas, and the Compromise that Preserved the Union. In this well wrought and powerful narrative, Smith examines the vital borderland of south central Pennsylvania. Challenging scholars to re-think our understanding of the fugitive slave law, Smith examines that issue through white and black perspectives over nearly fifty years of sectional conflict, war, and reconstruction. This is an important contribution to our understanding of how war itself intensified the fugitive slave issue and redirected it. Smith's thorough appendices demonstrate remarkable and comprehensive research reflected in this important narrative."-Orville Vernon Burton, author of The Age of Lincoln.