Instruct: Classify Amazon reviews into positive or negative sentiment
Query: astonishing, suspenseful, and true...

This book brings to vivid life the underground railroad and the politics of a nation poised on the brink of civil war. Slave catchers lurk around the edges of communities, hunting for escaped slaves or free blacks that they can kidnap. Radical abolitionists were militant about blocking any such kidnappers from reaching the south (regardless of the legality of the act). This book tells the true story of an escaped slave who is captured and then freed by a large group of Oberlin and Wellington abolitionists. This leads to a trial which made sensational national headlines and crystallized the growing crisis between north and south. It is absolutely gripping.