Which Mark Twain novel features the runaway slave Jim?

The Mark Twain novel featuring the runaway slave Jim is Adventures of Huckleberry Finn. Published in 1884, it follows Huck Finn and Jim as they travel by raft down the Mississippi River while seeking freedom and trying to avoid capture.

Jim is enslaved by Miss Watson, the sister of Huck's guardian, the Widow Douglas. After overhearing that Miss Watson plans to sell him farther south, Jim runs away and eventually meets Huck on Jackson's Island. Their journey toward Cairo, Illinois, forms the central movement of the novel, though floods, criminals, feuds, con artists, and accidents repeatedly disrupt their plans.

The story is narrated by Huck, whose language reflects the regional speech and racial attitudes of the period in which the novel is set. Twain uses Huck's growing loyalty to Jim to expose the cruelty and moral contradictions of slavery. Jim is not merely a plot device: he is a loving father, a practical companion, and one of the novel's moral centers.

Readers sometimes confuse this book with The Adventures of Tom Sawyer, because Tom appears in it and the two novels share characters and settings. Huckleberry Finn is the later sequel and Jim's escape story is central to it.