Letters from the Earth, written after both his wife and one of his daughters had died. Like his autobiography, it was published posthumously. It’s cynical but amusing in places. The Adventures of Tom Sawyer is a wonderful classic. The Mysterious Stranger and other stories has some real gems in it. A Connecticut Yankee in King Arthur's Court is okay but not my favorite. Tom Sawyer Detective and The Prince and the Pauper are amusing but not his best work.