In 1798, Daniel Dickinson, a young Quaker father and widower, leaves his home in Pennsylvania to establish a new life. He sets out with two horses, a wagonful of belongings, his five children, a 15-year-old orphan wife, and a few land warrants for his future homestead. 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 sets in motion a chain of events that lead to two murders and the family's strange relationship with a runaway slave named Bett.