Walk Through Darkness

Walk Through Darkness is a 2002 novel by American author David Anthony Durham.
Plot summary.
When he learns that his pregnant wife has been spirited off to a distant city, William responds as any man might—he drops everything to pursue her. But as a fugitive slave in antebellum America, he must run a terrifying gauntlet, eluding the many who would re-enslave him while learning to trust the few who dare to aid him on his quest.
Among those hunting William is Morrison, a Scot who as a young man fled the miseries of his homeland only to discover more brutal realities in the New World. Bearing many scars, including the loss of his beloved brother, Morrison tracks William for reasons of his own, a personal agenda rooted in tragic events that have haunted him for decades.
"Walk Through Darkness" is a provocative meditation on racial identity, freedom and equality. It followed Durham's award-winning "Gabriel's Story" and preceded his bestselling "Pride of Carthage".