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Twain (the pen name of Samuel Clemens) first introduced Huck Finn as the best friend of Tom Sawyer, hero of his tremendously successful novel The Adventures of Tom Sawyer (1876). Though Twain saw Huck’s story as a kind of sequel to his earlier book, the new novel was far more serious, focusing on the institution of slavery and other aspects of life in the antebellum South.
At the book’s heart is the journey of Huck and his friend Jim, a runaway enslaved person, down the Mississippi River on a raft. Jim runs away because he is about to be sold and separated from his wife and children, and Huck goes with him to help him get to Ohio and freedom.