As the son of a ship captain, it was clear John Newton's destiny was to be found at sea. But when he leaves Plymouth aboard the HMS Harwich full of promise, he has no idea about the strange directions his life will take. The journey would find him reduced to an outcast and a servant of slaves in Africa. Refusing to believe he had disappeared, Mary Catlett takes steps to locate him and waits patiently for his return. Meanwhile Newton has become a slave trader with one goal: to quickly make a fortune and find his way back to civilization. When a storm at sea brings the young captain to his knees, his outlook changes forever. It's an event that would inspire him to write the incredible hymn "Amazing Grace."