"The Adventures of Huckleberry Finn" is a novel by Mark Twain, first published in 1884. The book is a direct sequel to "The Adventures of Tom Sawyer" and is considered one of the Great American Novels. Set in the American South before the Civil War, it follows the journey of young Huckleberry Finn and an enslaved man named Jim as they travel down the Mississippi River on a raft. The novel delves into themes of race, class, and morality and is known for its biting social criticism and complex characters.