Lee Stone is a twenty-nine-year-old communications director at Lise Motors, a female-led electric vehicle company in Austin, Texas. Known to her friends as "Stoner," she is sharp, ambitious, and fiercely protective of her heart. After a series of romantic betrayals, beginning with her father's infidelity and continuing through three failed relationships, Lee has sworn off love entirely. She keeps men at a distance, avoids commitment, and channels her energy into her career, specifically a landmark piece of legislation called the Green Machine bill, which would replace all Texas state vehicles with electric ones.
Lee's carefully maintained equilibrium shatters when she learns that the governor's new policy director is Ben Laderman, her ex-boyfriend from grad school and the man she considers her greatest mistake. Years earlier, Lee convinced herself Ben was cheating based on flirtatious texts from a study partner, then slept with his law school rival, Connor Holliday, in preemptive retaliation. The fallout destroyed Ben's class ranking and cost him a clerkship, and he left Texas for California.
At their first meeting in the Texas State Capitol, Ben pretends not to know Lee, and she plays along. Governor Grover Mane, a moderate Republican, instructs them to work together to win over three holdout state senators: Janus, Wayne, and McBuck. Left alone, they drop the act. Ben reveals he knew Lee was involved with the bill and declares he intends to outperform her. They strike a bet: whoever secures the most senate votes wins, and the loser becomes the winner's assistant.
The competition sends them across Texas. Lee forces Ben to dress as Captain Planet at a Comic-Con in Senator Janus's district, where they gather thousands of petition signatures. At a Renaissance festival, an unguarded moment of nostalgia causes Lee to take Ben's hand before catching herself. Ben then reveals he has a girlfriend, Sarah Drake, a lobbyist whose firm represents Mendax Oil, the bill's biggest corporate opponent. Lee is privately stung to learn Ben moved back to Texas partly for Sarah.
Ben scores the first victory by leveraging a personal connection to Willie Nelson, who records a viral endorsement video that pressures Senator Janus into supporting the bill. Lee is furious that Ben hid his strategy, and their partnership fractures. At a celebratory lunch, Lee's CEO, Dakota Young, jokes about offering Ben the vice president of public affairs position Lee covets, deepening her sense of professional threat.
Lee rebounds by winning Senator Wayne's vote. At a county rodeo, she identifies the senator's closest confidant, a rancher named Ely Gunther, and travels with Ben to his remote property. When their car breaks down, Ely hosts them overnight. Around a campfire, Lee shares her full political vision, and Ely pledges to write a public editorial urging Wayne to support the bill. That evening, Lee and Ben share painful confessions: Lee reveals her father died in a car accident two years earlier without any reconciliation between them, and Ben admits his own father abandoned the family when he was ten. When Ben falls asleep beside her in the guest bed, Lee spends the night electrified by his proximity but exercises restraint.
The intimacy rattles Ben. He becomes distant for weeks, and when Wayne's vote officially comes through, the score is tied 1–1 with only McBuck remaining. They agree to stay professional and go their separate ways once the campaign ends.
At a wine festival in McBuck's district, they infiltrate a Mendax Oil event. Ben confesses he broke up with Sarah after the night at Ely's ranch and admits he cannot stop thinking about Lee. She kisses him, but Ben pulls away, insisting he cannot repeat the past. He calls her an Uber and she leaves, humiliated. Their prospects worsen when Samuel Slittery, the CEO of Mendax Oil, reveals he has flipped all three senators with large campaign donations, declaring the bill dead.
At the Governor's Ball, Lee and Ben's tension boils over. They argue, confess their feelings, and sleep together in a guest bedroom. Immediately afterward, Dakota and Governor Mane stumble in, exposing their own affair. Lee discovers Ben already knew and kept it from her. Feeling doubly betrayed by her mentor and her lover, she declares she is done and leaves.
Lee spirals. She rejects her sister Alexis's decision to reconcile with her cheating ex, severing their relationship. Dakota announces she will bypass the campaign and buy the senators' votes with donations, overruling Lee's objections. In the Lise pumping room, Ben confesses he is in love with Lee and begs her not to push him away. Lee admits she loves him too but insists love is not enough, and walks out. She throws a reckless house party, takes an unidentified pill, and drinks heavily. Ben arrives after receiving her incoherent texts and stays to watch over her. Afterward, Lee walks to her father's grave for the first time, speaking to him aloud, forgiving him and asking for forgiveness in return.
In the weeks that follow, Lee begins to change. Her mother urges her to forgive her father and herself. Her friend Annie, a therapist, asks Lee to be maid of honor at her wedding and delivers a crucial insight: Lee's avoidance of relationships stems not from distrusting others but from not believing she is worth loving. At Annie's birthday dinner, Annie proposes to her girlfriend, Zoey. Lee has a panic attack in the garden, overwhelmed by evidence that lasting love exists when she has built her life around the belief that it does not. Ben follows her, and Lee finally articulates the root of her self-sabotage: She was too happy with him, and the fear of losing something that good drove her to destroy it first. They share a kiss before being interrupted.
When news of Dakota's affair with the governor breaks on Fox News, leaked by Slittery, the media condemns Dakota while largely ignoring the governor's role. Dakota plans a press conference to resign, but at the podium, Lee abandons her prepared remarks. She excoriates the media for their sexist double standard, confesses her own imperfections, and argues that personal mistakes should not disqualify professional accomplishments. Inspired, Dakota pivots from resignation to defiance, vowing to fight anyone who tries to take her company or her bill.
The governor's pollster reveals that Ben, before disappearing on a mysterious road trip, commissioned opinion research showing the bill and Lee personally are enormously popular. Lee calls Senator McBuck and proposes locating Lise's new manufacturing center in his district, creating thousands of jobs. When the Senate votes, all three holdout senators vote yes. The Green Machine passes. Lee celebrates but aches over Ben's absence, leaving him a long voice mail confessing her love.
Days later, Ben appears at Lee's house wearing a "Stoner for State Senate" T-shirt. He drops to one knee, not to propose marriage, but to propose that Lee run for state senate. He spent his absence traveling Texas to build support for her candidacy, securing backing from progressive organizations and a major financial commitment from Dakota. He asks to serve as her campaign manager, framing the role as the convergence of his two lifelong dreams: politics and Lee. Lee says yes to the campaign and to being his girlfriend.
One year later, Lee takes the stage at the Texas Democratic Convention. Her mother, Alexis, and her friends cheer from the front row. Ben manages the event from backstage, having found his place behind the scenes. Lee grips the podium and introduces herself: Her name is Lee Stone, but her friends can call her Stoner.