Mysterious Stranger and Other Stories (version 2), The by Mark Twain (1835 - 1910)

The Mysterious Stranger-A Romance- is the final novel attempted by Mark Twain. 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". (Wikipedia and John Greenman)