It was a cold December evening in 1785. A man walked purposefully down a cobblestone street in East London, his breath clouding in the still air. In his mid-twenties, he could have been mistaken for older, and probably would have been recognised had anyone looked closely enough. A prominent Member of Parliament, he had quietly slipped away from the public eye to this unlikely part of town, intent on finding an answer to a nagging question.
Stopping before a door, he hesitated—and knocked. The door opened to reveal a white-haired man in his later years, who welcomed him, taking his coat. That night, a conversation between two men would change the history of their nation. The home was that of John Newton, the preacher who had been a slave trader. His visitor was William Wilberforce.