In 1798 Daniel Dickinson, a young Quaker, sets out with two horses, a wagon full of belongings, his five children and a 15-year-old orphan wife. When Daniel suddenly trades a horse for a young slave, Onesimus, it sets in motion a struggle in his conscience that will taint his life forever, and a chain of events that lead to two murders and the family's strange relationship with a runaway slave named Bett.