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Gregory Peck as Atticus Finch in “To Kill a Mockingbird.” CreditUniversal Studios 
With all the debate brewing over the origins of Harper Lee’s novel “Go Set a Watchman,” the biggest bombshell turned out to be an explosive plot twist that no one saw coming.
Atticus Finch — the crusading lawyer of “To Kill a Mockingbird,” whose principled fight against racism and inequality inspired generations of readers — is depicted in “Watchman” as an aging racist who has attended a Ku Klux Klan meeting, holds negative views about African-Americans and denounces desegregation efforts. “Do you want Negroes by the carload in our schools and churches and theaters? Do you want them in our world?” Atticus asks his daughter, Jean Louise (the adult Scout), in “Watchman.”
The revelation will probably alter readers’ views of “Mockingbird,” a beloved book that has sold more than 40 million copies globally and has become a staple of high school curriculums. It could also reshape Ms. Lee’s legacy, which until now has hinged entirely on the outsize success of her only novel, published 55 years ago.
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Atticus Finch (Gregory Peck) defended Tom Robinson (Brock Peters) in the 1962 film version of “To Kill a Mockingbird.” CreditUniversal Studios 
It is also certain to spur debate about the character of Atticus and his moral integrity in “Mockingbird,” which made him a cultural icon whose influence transcended literature, inspiring generations of lawyers, teachers and social workers.
“Whether you’ve read the novel or seen the film, there’s this image you have of Atticus as a hero, and this brings him down a peg,” said Adam Bergstein, an English teacher in Queens whose 10th- and 11-grade students read “Mockingbird.” “How do you take this guy who everybody looked up to for the last 50-plus years, and now he’s a more flawed individual?”
In this version, Atticus is 72 years old, suffering from arthritis and stubbornly resistant to social change. He stands in sharp contrast to the gentle scholar in “Mockingbird,” who tells Scout, when explaining why he has gone out on a limb to defend a black man, that “I do my best to love everybody.”
In “Watchman,” which comes out Tuesday, Atticus chides Scout for her idealistic views about racial equality: “The Negroes down here are still in their childhood as a people.”
After the initial shock, some writers and literary critics see added value in a more complex, and flawed, version of Atticus. If “Mockingbird” sugarcoats racial divisions by depicting a white man as the model for justice in an unjust world, then “Watchman” may be like bitter medicine that more accurately reflects the times.
“If Atticus Finch is not quite the plaster saint that he is in ‘To Kill a Mockingbird,’ there could be something rich and fascinating about that,” said Thomas Mallon, a novelist and critic, who had read only the published excerpt from “Watchman.” “The moral certainties in ‘To Kill a Mockingbird’ are apparent from the first page, and in that sense, I don’t think it’s a great novel that deals with the tormenting questions of race in America, but maybe this new one is, if it’s more nuanced.”
Racism, inequality and the persecution of minorities in the United States have again surfaced in the national conversation. Last week, the South Carolina legislature took down the Confederate battle flag from its statehouse grounds after days of emotional debate. Protests have erupted around the country after police shootings of unarmed black men.
“Watchman,” which was completed in 1957, is landing in the middle of the debate, like a literary artifact out of a time capsule from a period when the country was divided over many of the same issues.
“We could turn this into a plus in our national conversation about racism and the Confederate flag. It turns out that Atticus is no saint, as none of us are, but a man with prejudices,” said Charles J. Shields, author of “Mockingbird: A Portrait of Harper Lee.”
It is unclear why Ms. Lee set aside “Watchman” — a blunt and unsparing look at a young woman’s disillusionment at the racism that permeates her hometown and her family — to write “Mockingbird,” a more palatable coming-of-age tale. Narrated by a precocious, observant child, “Mockingbird” features characters who fall neatly into camps of heroes and villains. Gregory Peck’s portrayal of Atticus in the 1962 film is an enduring symbol of a righteous lawyer and model parent.
Was the original manuscript too politically explosive for the period — too sharp a reflection of the civil rights battles brewing at the time? Since Ms. Lee’s original editor, Tay Hohoff, died in 1974, and Ms. Lee has shunned interviews for decades, the question will probably remain unanswered, though there no doubt will be countless term papers and scholarly essays devoted to the subject for years to come.
“ ‘Go Set a Watchman’ is much more forcefully about civil rights. It’s much more political, but that tells us what was in front of Harper Lee’s brain at the time,” said Mary McDonagh Murphy, a filmmaker who recently released a new version of “Hey, Boo,” her documentary about Harper Lee. When she submitted the novel nearly 60 years ago, Ms. Lee was told to rewrite the book from young Scout’s perspective and to turn it into a coming-of-age story. “My editor, who was taken by the flashbacks to Scout’s childhood, persuaded me to write a novel from the point of view of the young Scout,” Ms. Lee said in a statement. “I was a first-time writer, so I did as I was told,” Ms. Lee said in a statement that was released by her publisher in February.
Ms. Lee wrote “Watchman” when, like Jean Louise, she was living in New York and occasionally traveling home to Alabama to visit her aging father, the lawyer A. C. Lee, who is commonly cited as the model for Atticus in “Mockingbird.” In letters she wrote at the time to a friend in New York, she describes feeling unmoored by his physical decline and impending death (“I found myself staring at his handsome old face, and a sudden wave of panic flashed through me”).
She also recounts feeling like an outsider in her hometown because of her stance on civil rights: “I don’t trust myself to keep my mouth shut if I feel moved to express myself, thereon it will get out all over Monroeville that I am a member of the N.A.A.C.P., which, God forbid. They already suspect this to be a fact anyway.”
While A. C. Lee was moderate by the standards of the times, he supported states’ rights and held segregationist views, according to Mr. Shields. Later, after the publication of “Mockingbird” in 1960, his views softened, and he started campaigning for redistricting in the county to protect disenfranchised African-American voters, Mr. Shields said.
As the first reviews of the novel were published on Friday, some “Mockingbird” fans were so disheartened by the revelation that they said they were reluctant to read the new book.
“It feels very personal to a lot of us, especially so in Alabama,” said Jamie Harding, 54, who lives in Birmingham, Ala. “We grew up looking up to this character, and a lot of my friends are saying, ‘I’m not reading it, I want Atticus to remain the Atticus that I adore.’ ”
Tara Xanthopoulos, who teaches high school English in Westchester County, N.Y., said that when she first read the reviews of the book, she felt queasy. “This has been my favorite book of my whole life, from when I was a student to being a teacher,” she said. “It’s sad to think that Atticus’s character is going to be tarnished.”
Ms. Lee’s publisher, HarperCollins, said there was never a discussion of toning down Atticus’s racist remarks to preserve his moral image.
“Harper Lee wanted to have the novel published exactly as it was written, without editorial intervention,” Jonathan Burnham, the publisher of the HarperCollins imprint Harper, wrote in an email message. “By confronting these challenging and complex issues at the height of the civil rights movement, the young Harper Lee demonstrated an honesty and bravery that makes this work both a powerful document of its time and a compelling piece of literature.”
Karla FC Holloway, a professor of English and law at Duke University who teaches a class on law, race and literature, said that the new version of Atticus may lead people to reread “Mockingbird” more closely. “It will force an interesting conversation about — if this is really Atticus — what have our own desires done to the character, and what is the literary truth?” Ms. Holloway said. “This is who we want to be as a country, but this is not who Atticus was.”
Correction: July 11, 2015 
Because of an editing error, an earlier version of a picture caption with this article misspelled the name of the actor who played Tom Robinson in “To Kill a Mockingbird.” He was Brock Peters, not Peterson.