Russell Green, a first-person narrator, works as an advertising executive at the Peters Group in Charlotte, North Carolina, when his wife Vivian becomes pregnant only three weeks after stopping birth control. Their daughter, London, is born on October 16, 2009, and Vivian quits her public relations job to become a stay-at-home mother, making Russell the sole provider. Russell describes himself as a lifelong people pleaser and hopeless romantic, traits he traces to watching films like
Pretty Woman with his older sister Marge as a child.
Russell's family anchors much of his story. His father is a practical, blue-collar man who shows love through action rather than words; his mother, Gladys, is a warm worrier. Marge, a witty accountant, has been in a committed relationship with her partner Liz, a marriage and family therapist, for over a decade. Marge came out as gay in her teens, prompting their Southern Baptist father to leave the church rather than condemn his daughter. Before Vivian, Russell loved Emily, a painter he lost after confessing a one-night stand. He met Vivian at a Manhattan cocktail party in 2006, proposed on the Empire State Building on Valentine's Day, and married her in November 2007. Over the years, Vivian grows moodier and more critical, oscillating between warmth and contempt.
Russell works punishing hours, maximizing bonuses on accounts he despises, including one for Walter Spannerman, a billionaire developer. His boss, Jesse Peters, harbors an obvious attraction to Vivian, and Russell's promotions coincide suspiciously with her appearances at office events. After the December 2014 Christmas party, Peters grows cold and installs a rival to undermine Russell. Recognizing he will be fired, Russell quits in mid-May 2015 to launch his own firm, the Phoenix Agency, despite Vivian's objections and his father's skepticism.
The agency attracts no clients in its first month. Meanwhile, Vivian reveals she has been secretly interviewing for a position with Spannerman's company. She starts the job immediately, asking Russell to watch London since she has not arranged day care. Their roles reverse: Russell becomes London's primary caregiver, managing art, piano, dance, and tennis while cold-calling potential clients. Through exhausting weeks, the two develop a deep bond. Russell teaches London to ride a bicycle, plays Barbies, and reads to her every night. Their favorite bedtime story becomes Noah's ark, with its refrain of animals boarding "two by two," a phrase that becomes a recurring motif for companionship.
At London's tennis camp, Russell meets Joey Taglieri, a boisterous personal injury attorney dissatisfied with his current advertising. Russell also reconnects with Emily, now divorced and raising her five-year-old son, Bodhi, London's classmate and best friend. Emily offers encouraging feedback on Russell's multi-commercial campaign concept for Taglieri. Russell pitches Taglieri and wins him as his first client.
Vivian grows increasingly enmeshed with Spannerman. She announces that the company is relocating its headquarters to Atlanta and that she will oversee the transition, spending several nights a week there. Russell discovers she has opened a separate bank account without telling him. She takes a corporate apartment and grows distant. On Labor Day evening, after London is in bed, Vivian tells Russell she has fallen in love with Spannerman, is moving to Atlanta, and is leaving that night on his private jet. She says London should stay with Russell for now.
Russell is devastated. Marge takes a day off to care for him, and Liz counsels that his grief is normal. Emily becomes a crucial support, walking a golf course for hours with Russell while he pours out his story and sharing wisdom about surviving her own divorce. They take the children to the zoo and the aquarium, and Russell begins calling Emily nightly. Their friendship deepens into something more. Vivian begins visiting Charlotte on alternating weekends. At a tense lunch, she tells Russell she wants a divorce and refuses to discuss reconciliation.
Russell's professional life gains momentum. Taglieri's commercials air and generate a flood of calls; five more law firms contact Russell, and he signs four. He also lands a plastic surgeon as a second client. London suffers a serious bicycle accident, crashing into a mailbox and sustaining a head wound, a possible wrist fracture, and a concussion. Vivian flies in on Spannerman's jet, and the crisis produces an unexpectedly civil interlude; she acknowledges Russell is doing a good job with London. Russell withdraws London from her demanding dance class after the instructor bars London from the recital due to absences caused by the accident.
Russell and Emily attend her gallery opening together, and at a rooftop bar he confesses he is in love with her but not yet ready for a relationship. Emily reveals she loves him too and is willing to wait. On New Year's Eve, they nearly kiss at midnight. Vivian erupts when she learns London has been spending time with Emily, accusing Russell of confusing their daughter. When Russell decides to fight for primary custody, Vivian's attorney responds with a threatening letter that paints him as an unfit father. Russell drives to Wrightsville Beach alone to process his rage.
On the Saturday after Thanksgiving, Liz calls at dawn: Marge has been admitted to the hospital after coughing up blood. Tests reveal advanced adenocarcinoma, a form of lung cancer, that has spread to both lungs, lymph nodes, bones, and brain. The oncologist confirms the cancer is incurable. Marge, the only family member who does not cry, asks bluntly how long she has; the doctor cannot promise even six months. Marge tells Russell to keep living his life, insisting he is the rock everyone else will need.
Through the winter, Marge orchestrates meaningful time with each loved one: taking London roller skating, traveling to New York with Liz, watching
Pretty Woman with Russell, and climbing the neighborhood water tower with him. She gives London the DVD of
Pretty Woman to watch someday, and London gives Marge her first Barbie doll. In one of Marge's final lucid exchanges with Russell, she listens as he reads aloud a letter thanking her for teaching him what true love looks like. She tells him not to let Emily go and manages one last joke. After two final days alone with Liz, Marge dies. At the graveside funeral, London attaches butterfly wings and dances around her aunt's freshly turned earth.
The day after the funeral, Russell meets with Vivian. She apologizes for the attorney's letter and reveals that a private conversation with Marge changed her perspective. She agrees to a fair property split and shared custody, provided Russell relocates to Atlanta. Russell accepts, understanding what Marge had been guiding him toward: Rather than force London to choose between her parents in court, he should move to be near his daughter.
In the epilogue, Russell narrates from late July in Atlanta. The Phoenix Agency is thriving with two new employees, and he has established a shared custody arrangement that keeps him in London's daily life. Emily has moved to Atlanta with Bodhi, and she and Russell have begun a romantic relationship he expects will lead to engagement. Vivian, now secretly engaged to Spannerman, declined alimony and accepted a fair settlement. Liz is considering having a baby, using money from life insurance policies Marge quietly purchased years earlier, one for Liz and another for Russell's parents so his father can retire. Russell reflects that he survived the worst year of his life because he never walked it alone. London, Marge, and Emily each walked beside him, two by two, and he carries Marge's voice with him still.