The Mysterious Stranger

The Mysterious Stranger is a tale that is itself both mysterious and strange.
Written by Mark Twain, better known for such humorous tales as Tom Sawyer and Huckleberry Finn, the story concerns the visit of Satan to a medieval Austrian village. One of several versions which he wrote during his later life, it was only published posthumously by his biographer. It is a deeply serious book which examines the nature of morality and maintains a scathing attack on organized religion as a tool of oppression.
If you are interested in seeing another side of one of America's most famous authors, The Mysterious Stranger is a fascinating read.