The Mysterious Stranger is Mark Twain's final novel. It was worked on periodically from roughly 1890 up until 1910. The body of work is a serious social commentary by Twain addressing his ideas of the Moral Sense and the "damned human race". The story tells of the adventures of Satan, the sinless nephew of the biblical Satan, in an Austrian village in the Middle Ages. Classic storytelling. A very interesting side of Twain's writings.