Go Set a Watchman is a novel by Harper Lee that was published in 2015 by HarperCollins (US) and Heinemann (UK). Written before her only other published novel, To Kill a Mockingbird (1960), Go Set a Watchman was initially promoted as a sequel by its publishers. It is now accepted that it was a first draft of To Kill a Mockingbird, with many passages in that book being used again.

The title comes from the Book of Isaiah in the Hebrew Bible: "For thus hath the Lord said unto me, Go, set a watchman, let him declare what he seeth" (Chapter 21, Verse 6), which is quoted in the book's seventh chapter by Mr Stone, the minister character. It alludes to Jean Louise Finch's view of her father, Atticus Finch, as the moral compass ("watchman") of Maycomb, Alabama, and has a theme of disillusionment as she discovers the extent of the bigotry in her home community. Go Set a Watchman tackles the racial tensions brewing in the South in the 1950s and delves into the complex relationship between father and daughter. It includes treatments of many of the characters who appear in To Kill a Mockingbird.

A significant controversy around the decision to publish Go Set a Watchman centered on the allegations that 89-year-old Lee was taken advantage of by her publishers and pressured into allowing publication against her previously stated intentions. Later, when it was realized that the book was an early draft as opposed to a distinct sequel, it was questioned why the novel had been published without any context.

HarperCollins, United States, and William Heinemann, United Kingdom, published Go Set a Watchman on July 14, 2015. The book's unexpected discovery, decades after it was written, and the status of the author's only other book as an American classic, caused its publication to be highly anticipated. Amazon stated that it was their "most pre-ordered book" since the final novel in the Harry Potter series, Harry Potter and the Deathly Hallows, in 2007 and stores arranged all-night openings beginning at midnight to cope with expected demand. Go Set a Watchman set a record for the highest adult-novel one-day sales at Barnes & Noble, which included digital sales and orders placed before July 14. Barnes & Noble did not release the exact number.

Plot Jean Louise "Scout" Finch, 26 and single, returns from New York to her hometown of Maycomb, Alabama, for her annual fortnight-long visit to her father, Atticus, a lawyer and former state legislator. Jack, her uncle and a retired doctor, is Jean Louise's mentor. Atticus' sister (Jean Louise's aunt), Alexandra, has moved in with Atticus to help him around the house after his housekeeper, Calpurnia, retired. Jean Louise's brother, Jeremy "Jem" Finch, has died of the same heart condition as killed their mother. On her arrival in Maycomb, Jean Louise is met by her childhood sweetheart, Henry "Hank" Clinton, who works for Atticus. When returning from Finch's Landing, Jean Louise and Henry are passed by a car full of black men travelling at a dangerously high speed; Henry mentions that the black people in the county have money for cars, but are without licenses and insurance.

The Supreme Court's decision in Brown v. Board of Education and the National Association for the Advancement of Colored People (NAACP) are introduced as sources of controversy in the community. Jean Louise finds a pamphlet titled The Black Plague among her father's papers. She follows him to a Citizens' Council meeting where he introduces a man who delivers a racist speech. Jean Louise watches in secret from the balcony and is horrified. She is unable to forgive Atticus for his behaviour, and flees the hall. After dreaming about Calpurnia, her family's black maid, whom she sees as a mother figure, Jean Louise has breakfast with her father. They soon learn that Calpurnia's grandson killed a drunk pedestrian the previous night while speeding in his car. Atticus agrees to take the case in order to stop the NAACP from getting involved. Jean Louise visits Calpurnia and is treated politely but coldly, causing her to leave, devastated.

At lunch, Jean Louise wants to know why Atticus was at the meeting. Uncle Jack tells her that Atticus has not suddenly become a racist, but that rather he is trying to slow down federal government intervention into state politics. Her uncle lectures her on the complexity of history, race, and politics in the South in an attempt to get her to reach a conclusion, which she struggles to grasp. She then has a flashback to when she was a teenager and recalls an incident when Atticus planted the seed for an idea in Henry's brain then let him come to the right conclusion on his own. Jean Louise tells Henry that she does not love him and will never marry him. She expresses her revulsion at having seen him with her father at the council meeting. Henry explains that sometimes people have to do things they don't want to do. Henry then defends his own case by saying that the reason that he is still part of the Citizens' Council is that he wants to use his intelligence to make an impact on his hometown of Maycomb and to make money to raise a family. Jean Louise screams that she could never live with a hypocrite, only to notice that Atticus is standing behind them, smiling.

During a discussion with his daughter, Atticus argues that the blacks of the South are not ready for full civil rights, and that the Supreme Court's decision was unconstitutional and irresponsible. Although Jean Louise agrees that the South is not ready to be fully integrated, she says the court was pushed into a corner by the NAACP and had to act. She is confused and devastated by her father's positions, which are contrary to everything he has ever taught her. She returns to the family home furious and packs her things. As she is about to leave town, her uncle comes home. She angrily complains to him, and he slaps her across the face. He tells her to think of all the things that have happened over the past two days and how she has processed them. When she says she can now stand them, he tells her it is bearable because she is her own person. He says that at one point she had fastened her conscience to her father's, assuming that her answers would always be his answers. Her uncle tells her that Atticus was letting her break her idols so that she could reduce him to the status of a human being.

Jean Louise returns to the office and makes a date with Henry for the evening. She reflects that Maycomb has taught him things she had never known and rendered her useless to him except as his oldest friend. She goes to apologize to Atticus, but he tells her how proud of her he is. He hoped that she would stand for what she thinks is right. She reflects that she did not want her world disturbed, but that she tried to crush the man who is trying to preserve it for her. Telling him that she loves him very much as she follows him to the car, she silently welcomes him to the human race. For the first time, she sees him as just a man.

Development history Initially, Go Set a Watchman was promoted by its publisher, and described in media reports, as a sequel to Lee's best-selling novel, To Kill a Mockingbird, which was published in 1960, but it is actually the first draft of that novel. The novel was finished in 1957 and purchased by the J.B. Lippincott Company. Lee's editor, Tay Hohoff, was impressed by elements of the story, and stated that "the spark of the true writer flashed in every line", but she thought that it was by no means ready for publication, being, as she described it, "more a series of anecdotes than a fully conceived novel". In his Times article on Hohoff, Jonathan Mahler states that Hohoff thought the strongest aspect of Lee's novel was the flashback sequences featuring a young Scout, which is why she asked Lee to use those flashbacks as a basis for a new novel. Lee agreed, and "during the next couple of years, Hohoff led Lee from one draft to the next until the book finally achieved its finished form and was retitled To Kill a Mockingbird."

According to Mahler, "Ms. Hohoff also references a more detailed characterization of the development process, found in the Lippincott corporate history: 'After a couple of false starts, the story-line, interplay of characters, and fall of emphasis grew clearer, and with each revision—there were many minor changes as the story grew in strength and in her own vision of it—the true stature of the novel became evident.' (In 1978, Lippincott was acquired by Harper & Row, which became HarperCollins, publisher of Watchman.)" Mahler remarks that "there appeared to be a natural give and take between author and editor. 'When she disagreed with a suggestion, we talked it out, sometimes for hours,' Ms. Hohoff wrote. 'And sometimes she came around to my way of thinking, sometimes I to hers, sometimes the discussion would open up an entirely new line of country.'"

Various theories have been offered as to why the initial characterization of Atticus as a segregationist was dropped in the later novel. Mahler suggests that it could have been Hohoff who inspired the change. Raised "in a multigenerational Quaker home near Prospect Park in Brooklyn, Hohoff attended a Quaker school, Brooklyn Friends. Such an upbringing suggests certain progressive values. But probably the clearest window into her state of mind when she was coaching Ms. Lee through the rewrite of Mockingbird is the book she was writing herself at the time: a biography of John Lovejoy Elliott, a social activist and humanist in early-20th-century New York who had committed his life to helping the city's underclass. The book, A Ministry to Man, was published in 1959, one year before Mockingbird."

Michiko Kakutani noted the changes between the two versions: "Some plot points that have become touchstones in Mockingbird are evident in the earlier Watchman. Scout's older brother, Jem, vividly alive as a boy in Mockingbird, is dead in Watchman; the trial of a black man accused of raping a young white woman ... is only a passing aside in Watchman. (The trial results in a guilty verdict for the accused man, Tom Robinson, in Mockingbird but leads to an acquittal in Watchman.)" She continues, "Students of writing will find Watchman fascinating for these reasons: How did a lumpy tale about a young woman's grief over her discovery of her father's bigoted views evolve into a classic coming-of-age story about two children and their devoted widower father? How did a distressing narrative filled with characters spouting hate speech (from the casually patronizing to the disgustingly grotesque—and presumably meant to capture the extreme prejudice that could exist in small towns in the Deep South in the 1950s) mutate into a redemptive novel associated with the civil rights movement, hailed, in the words of the former civil rights activist and congressman Andrew Young, for giving us 'a sense of emerging humanism and decency?'"

Kakutani also states that not only are characterizations and plot points different, the motivation behind the novel shifts as well: "Somewhere along the way, the overarching impulse behind the writing also seems to have changed. Watchman reads as if it were fueled by the alienation of a native daughter — who, like Lee, moved away from small-town Alabama to New York City — might feel upon returning home. It seems to want to document the worst in Maycomb in terms of racial and class prejudice, the people's enmity and hypocrisy and small-mindedness. At times, it also alarmingly suggests that the civil rights movement roiled things up, making people who "used to trust each other" now "watch each other like hawks".