Cora is a slave on a cotton plantation in Georgia. When Caesar, a recent arrival from Virginia, tells her about the Underground Railroad, they decide to take a terrifying risk and escape. Though they manage to find a station and head north, they are being hunted. Their first stop is South Carolina, in a city that initially seems like a haven. But the city's placid surface masks an insidious scheme designed for its black denizens. And even worse: Ridgeway, the relentless slave catcher, is close on their heels. Forced to flee again, Cora embarks on a harrowing flight, state by state, seeking true freedom. Like the protagonist of Gulliver's Travels, Cora encounters different worlds at each stage of her journey -- hers is an odyssey through time as well as space. As Whitehead re-creates the unique terrors for black people in the pre-Civil War era, his narrative weaves the saga of America from the brutal importation of Africans to the unfulfilled promises of the present day.