Laurie Watkinson is a 36-year-old biracial criminal defense lawyer at Salter & Rowson, a Manchester law firm. She has been with her boyfriend, Dan Price, the firm's head of civil law, since they met at university at age 18. One night, after Laurie returns from an outing with her best friend Emily Clarke, Dan tells her he does not want children, does not want their life together, and wants to end the relationship. Laurie offers to abandon plans for a family entirely, but Dan insists the issue is larger. He describes feeling trapped, as though their future is a predetermined tunnel with nothing unexpected along the way. Laurie warns him that if he leaves, the damage is permanent. Dan moves out within days.
In the painful aftermath, Laurie tells her mother, Peggy, a singer from Martinique who raised Laurie alone in Hebden Bridge, Yorkshire. Laurie's father, Austin Watkinson, a DJ and producer from Manchester's late-1980s dance-music scene known as Madchester, was largely absent throughout her childhood. Peggy responds with philosophical calm, suggesting Dan must follow his own path. Austin, meanwhile, sends a message announcing his marriage in Ibiza and inviting Laurie to a Manchester reception. At work, Laurie and Dan agree to keep the breakup secret.
Two and a half months later, Dan asks to come over. Laurie is certain he wants to reconcile. Instead, he reveals he has met Megan Mooney, a lawyer at a rival firm, and that Megan is pregnant. Dan, who told Laurie he did not want children, has impregnated another woman within weeks of leaving. Laurie pushes him out of the house. She later discovers a shared Spotify playlist between Dan and Megan dating back six months, proving an emotional affair began while Dan was still with Laurie. When the news breaks at the office, Laurie endures public pity and sharp commentary. She also discovers her Chorlton friendship group gossiping about her in a WhatsApp chat, speculating that her sharpness drove Dan away. Laurie reveals her presence with a single message and leaves the group.
On a Friday evening, Laurie and Jamie Carter, a handsome and reputedly promiscuous young colleague, get trapped in the office lift for nearly two hours and bond during their confinement. Over drinks afterward, Jamie proposes an arrangement: They will fake a romantic relationship. Laurie gets to make Dan jealous, while Jamie, who has applied for a partnership but been told his casual dating lifestyle makes him unpromotable, gains the credibility of a steady girlfriend. They will post curated photos on social media, attend the Christmas party as a couple, and tell no one.
Despite Jamie's secrecy rule, Laurie tells Emily, who warns against it but reverses course after seeing Jamie's photos. Laurie gets a dramatic makeover, and they stage date photos at Manchester restaurants, generating a wave of attention. Mr. Salter calls Laurie in to express paternal concern, inadvertently boosting Jamie's promotion prospects. Michael, a colleague who has long harbored feelings for Laurie, corners her and aggressively warns her away from Jamie, an encounter Laurie recognizes as possessive and sexist.
Jamie then tells Laurie his father, Eric, a retired law lecturer in Lincoln, has terminal cancer. His parents want Jamie to bring Laurie to Eric's 65th birthday party. On the train, they exchange deeper histories: Jamie reveals that his older brother, Joe, was killed by a car when they were children, and Laurie shares the story of her absent father. That night, Jamie breaks down and confesses that as a nine-year-old, he was taunting Joe during a game of chicken in the road when Joe ran back and was hit. He carries crushing guilt. Laurie holds him and tells him he was a child. They fall asleep in each other's arms. The next morning, Jamie mentions he has met someone he might be falling in love with. Laurie feels a sharp pang of jealousy but does not yet understand he means her.
At Austin's belated wedding reception, Laurie recognizes Pete, one of her father's old friends, and a buried childhood memory surfaces: When she was eight, Austin left her with Pete, who told the child to sit on his lap and show him her underwear. She had escaped the flat alone, walked through nighttime Manchester, and been found by transport police, never telling anyone what happened in order to protect her relationship with her father. Overwhelmed, Laurie asks Jamie to leave with her and recounts the full story for the first time. She later tells Peggy during a walk in Whitworth Park. Peggy weeps, apologizes, and offers her analysis of Dan: He used Laurie as a "base camp," drawing strength from her without recognizing she was the source. Mother and daughter achieve a new closeness. When Austin later arrives nearly two hours late for a Sunday lunch, Jamie, who happens to be at the same restaurant with friends, confronts Austin, and Laurie tells her father she is done, walking away for good.
At the firm's Christmas party, Laurie sees Dan and a visibly pregnant Megan together for the first time. Observing Megan's performative adoration, Laurie understands what Megan offered: uncomplicated worship that made Dan feel in charge. Laurie and Jamie dance, and the sustained closeness produces undeniable chemistry. Shaken, Laurie retreats outside, where a stranger kisses her. Jamie witnesses it and is furious. Later that night, he arrives at her door and confesses that his feelings are real, that the pretense stopped being pretense around Lincoln, and that she is the person he has been falling in love with. They begin a genuine relationship.
Dan later visits, sees Jamie's shirt on Laurie's floor, and breaks down, confessing his departure was self-indulgent and driven by flattery. Laurie feels pity rather than triumph. On the day of Jamie's partnership meeting, Michael, who obtained Jamie's phone passcode through Eve, Mr. Salter's niece, forwards the original email exchange outlining the fake relationship plan to the entire staff. Jamie is fired; Laurie receives a verbal warning. When Salter asks if they are together, Jamie says no to protect Laurie's job. He reveals that Eve collaborated with Michael after Jamie rejected her romantic advance. Laurie, unable to shake the pattern of men's deceptions, challenges his honesty. They argue, and Jamie walks away.
Laurie processes the fallout with support from Emily and her friend Nadia. She meets with Mr. Salter and Mr. Rowson, the firm's other senior partner, speaks honestly, and takes responsibility. Rather than dismissing her, Salter tells Laurie to apply for the partnership in the new year.
On Christmas Eve, Jamie's childhood best friend Hattie calls and reads aloud a private email Jamie wrote the Sunday after he and Laurie first got together, describing her as the greatest thing that has happened to him. Hattie says Jamie is catching the four p.m. train to Lincoln. Laurie rushes to Piccadilly station and finds him on the platform. She apologizes for doubting him. Jamie gives her the silver leaf necklace she admired in Lincoln, along with a note asking for another chance. They reconcile, and Laurie proposes marriage on the spot, arguing that conventional timelines have taught her only to stop following them. Jamie accepts. They plan to take a later train to Lincoln for Christmas with his parents. In the Refuge bar, Laurie calls Emily to share the news, the novel ending where it thematically began, with Laurie choosing her own happiness on her own terms.