“Adventures of Huckleberry Finn,” the critic Lionel Trilling wrote, is “one of the world’s great books and one of the central documents of American culture,” in part because it grows with its readers. Mark Twain’s 1884 novel is a catapulting adventure story when one is 10, but its amplitude is grasped only in adulthood.

Here is a question Trilling did not pick up: What about the 10-year-old Black reader who wishes to be catapulted, too, but is too young to understand that the novel’s language, with its 219 uses of the N-word, derives from Twain’s writerly fidelity to the vernacular speech of the American South in the 1830s or 1840s, when the novel is set? This has long been an implacable and racking issue.

Paul Beatty, in his novel “The Sellout” (2015), wrestled with this conundrum. One of his characters decides to read “Huckleberry Finn” aloud to his grandchildren. He does not get far. Then he gets an idea.

Although they are the deepest-thinking, combat-ready 8- and 10-year-olds I know, I knew my babies weren’t ready to comprehend “Huckleberry Finn” on its own merits. That’s why I took the liberty to rewrite Mark Twain’s masterpiece. Where the repugnant “N-word” occurs, I replaced it with “warrior” and the word “slave” with “dark-skinned volunteer.”

Percival Everett’s majestic new novel, “James,” goes several steps further. Everett flips the perspective on the events in “Huckleberry Finn.” He gives us the story as a coolly electric first-person narrative in the voice of Jim, the novel’s enslaved runaway. The pair’s adventures on the raft as it twisted down the Mississippi River were largely, from Huck’s perspective, larks. From Jim’s — excuse me, James’ — point of view, nearly every second is deadly serious. We recall that Jim told Huck, in Twain’s novel, that he was quite done with “adventures.”

Everett’s James is indeed a warrior, of a humane, frazzled and reluctant sort. By the time this novel is finished, he will have killed men and freed fellow slaves and set fire to a particularly dismal plantation. He will be whispered about, a legend. What’s more, Everett has rendered him an ambitious reader, one who instantly grasps, for example, that the Bible is a tool of his oppressors, and who has extended internal dialogues with Jean-Jacques Rousseau, Voltaire and John Locke, sometimes about slavery. James is literate, and he is taking notes. These notes are costly. Another slave who pilfers a pencil stub for him is lynched for the act.

Because this is a Percival Everett novel, we are not surprised that he tears down and rebuilds a cultural landmark. In addition to his publishing-industry satire “Erasure,” which became the Cord Jefferson film “American Fiction,” this prolific writer has issued novels that take on the complicated legacies of historical figures. These include Sidney Poitier, in “I Am Not Sidney Poitier” (2009), which is one of the funniest novels I have ever read, and the prune-faced South Carolina segregationist Strom Thurmond, in “A History of the African-American People (Proposed) by Strom Thurmond, as Told to Percival Everett and James Kincaid” (2004).

Because this is a Percival Everett novel, too, it luxuriates in language. Everett, like Twain, is a master of American argot; he is the code switcher’s code switcher. In “James,” he puts his skills to incandescent use. His narrator runs his every public utterance through what he calls his “slave filter,” to make himself sound ridiculous and gullible, to pacify the truculent white people around him. Here is that practice in action, as James explains to a group of enslaved children in a cabin, including a girl named February, how to survive:

The children said together, “And the better they feel, the safer we are.”

“February, translate that.”

“Da mo’ betta dey feels, da mo’ safer we be.”

“Nice.”

And here is James, finding himself in Judge Thatcher’s library:

I had wondered every time I sneaked in there what white people would do to a slave who had learned how to read. What would they do to a slave who had taught the other slaves to read? What would they do to a slave who knew what a hypotenuse was, what

irony

meant, how

retribution

was spelled?

What sets “James” above Everett’s previous novels, as casually and caustically funny as many are, is that here the humanity is turned up — way up. This is Everett’s most thrilling novel, but also his most soulful. Beneath the wordplay, and below the packed dirt floor of Everett’s moral sensibility, James is an intensely imagined human being. Ta-Nehisi Coates, in “Between the World and Me” (2015), wrote that slavery is not “an indefinable mass of flesh” but “a particular, specific enslaved woman, whose mind is active as your own, whose range of feeling is as vast as your own.” Everett more than lives up to that prescription.

There are familiar large scenes, like Huck and James’s separation in a fog, and their encounter with the deadly con artists, the Duke and the King. But smaller moments are reproduced as well, such as James’s suffering after a rattlesnake bite and Huck’s need to dress like a girl to disguise his identity.

My idea of hell would be to live with a library that contained only reimaginings of famous novels. It’s a wet-brained and dutiful genre, by and large. Or the results are brittle spoofs — to use a word that, according to John Barth, sounds like imperfectly suppressed flatulence — that read as if there are giant scare quotes surrounding the action. Two writers in a hundred walk away unscathed.

“James” is the rarest of exceptions. It should come bundled with Twain’s novel. It is a tangled and subversive homage, a labor of rough love. “His humor and humanity affected me long before I became a writer,” Everett writes of Twain in his acknowledgments. “Heaven for the climate; hell for my long-awaited lunch with Mark Twain.”

Everett does not reprint the famous warning that greets the reader at the start of “Adventures of Huckleberry Finn”: “Persons attempting to find a motive in this narrative will be prosecuted; persons attempting to find a moral in it will be banished; persons attempting to find a plot in it will be shot.” Motives, morals and plot are here in abundance, of course. And Everett shoots what is certain to be this book’s legion of readers straight through the heart.