The Adventures of Huckleberry Finn: The True Sign of Maturity "To live with fear and not be afraid is the greatest sign of maturity." If this is true, then Mark Twain's Huck Finn is the greatest example of maturity. Huck is the narrator of Twain's book, The Adventures of Huckleberry Finn. In the book Huck, a young boy from the American South, travels down the Mississippi River with a runaway slave. The two encounter many adventures and meet many different people. Along the way, not only does Huck mature, but he also becomes a kind and loyal person, sometimes g