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The Macon slaves face questioning over their plans; at the same time, the mad dash to catch a train heading north comes with complications at every turn.
The runners find themselves being tracked down by a notorious slave hunter, while John and Elizabeth are confronted by a lethal predicament.
The road takes its toll on August; at the same time, the runners are trapped in a floating coffin; and Ernestine struggles to maintain her influence.
"Underground" follows a group of slaves who plan a daring escape from a Georgia plantation to cross 600 miles to freedom.