'The Adventures of Huckleberry Finn' is a book written by ______.

"The Adventures of Huckleberry Finn" is a novel written by American author Mark Twain. First published in the United Kingdom in December 1884 and in the United States in February 1885, it is often hailed as one of the Great American Novels. The story is narrated by Huckleberry "Huck" Finn, a young boy who embarks on a journey down the Mississippi River, exploring themes of race, identity, and morality. The novel is noted for its use of vernacular English and its portrayal of boyhood.