Unpardonable follows an alternative history from 1861 through 1938 as seen through the life of a fictional character, Benton Steuben. Steuben serves as the narrator of his life story as an old man speaking to a young family during the winter of 1937-38 with each chapter of the story being introduced chronologically by a newspaper headline from a particular day in history. A Pinkerton detective, Steuben's story is one of revenge against his young wife's...