Katherine Scarlett Johansson, Victoria Sienna Miller, and Georgina Emily Beecham return to their family home in the English countryside to attend their mother Diana's wedding to her third husband, Geoff. The gathering stirs up years of memory and fault lines as the sisters confront the legacies their father, John Frost, left behind and the complicated marriage that followed his death in the Falklands War. Diana’s romantic history—two Navy pilot husbands before Geoff—casts a bittersweet pall over the celebration, setting the stage for revelations that will ripple through the family.
Katherine, the eldest, is a trailblazing Royal Navy captain who has just become the first woman to command a British aircraft carrier. Her demanding career keeps her away at sea for long stretches, leaving her young son Marcus in the care of her longtime girlfriend, Jack Freida Pinto. Meanwhile Victoria, a glamorous Hollywood star, chases success and romance but struggles to sustain long-term connections. Georgina, the youngest and a palliative nurse, is not simply along for the ride; at Victoria's suggestion, she hires a private detective to probe her husband Jeremy Joshua McGuire for possible infidelity, hoping to uncover truth that might free her from uncertainty.
The wedding day unfurls with dramatic flair as Victoria’s wealthy, much older French lover Jerome, arriving by helicopter, re-enters her life despite her own warnings. The celebrations briefly sparkle with old flame and new flirtations, including a return to a childhood romance with Charlie Jamie Schneider. But the night shifts from joy to distrust when the private detective presents video footage of Jeremy in an intimate moment with another woman inside Georgina’s home. The moment lands with a sickening thud, and Georgina’s anger sharpens the sisterly tension that has simmered beneath the surface for years.
The family’s conversations unearth painful truths: Katherine recalls a moment years earlier when Jonathan Munson, the man Diana once loved and who later disappeared, asked to adopt her and Victoria, while she preferred to keep her birth father’s name. Victoria confesses a bitterness of being left feeling betrayed, and Katherine admits a separate, previously hidden history—she kissed another woman during a desert assignment in Africa, a fact Victoria uses to frame their argument. Georgina suspects that Victoria’s push for evidence of Jeremy’s infidelity is as much about controlling her own narrative as about the affair itself.
Back at Diana’s house, the tension deepens when Jack reveals that she is pregnant with their child through IVF, a decision she made to build a family with Katherine even though Katherine herself wants to keep her career intact. Jack’s choice to keep Katherine out of the loop before telling her creates a rift, and Katherine insists she cannot give up her vocation or co-parent a child she never asked for. The emotional strain of balancing duty, love, and future plans threads through the sisters as they grapple with who they are and who they want to be.
Dawn brings a new testing moment when Skylar, Victoria’s fourteen-year-old son, climbs a tree and a firefighter films Victoria in a moment of vulnerability. The incident leaves Diana feeling humiliated and triggers a harsh confrontation with Victoria, who lashes out at Geoff for not understanding what it means to raise children. Diana's response shocks everyone: she confronts the idealized memories of their fathers, admits the dangerous choices she made to protect her own happiness, and urges her daughters to let go of the past so they can find a path forward.
In the days that follow, Victoria takes a tentative step toward mending old wounds by apologizing to Geoff and agreeing to give Charlie a real chance. Georgina, bolstered by a new resolve, decides to divorce Jeremy and reclaim her life. The family comes together for Katherine’s promotion ceremony aboard HMS Prince of Wales, a moment that feels like a public vindication of her hard-won career and her commitment to those she loves. After the ceremony, Katherine and Jack begin to navigate the possibility of welcoming their baby into a redefined family, signaling a hopeful, if imperfect, new chapter for all of them.
Through joys and betrayals, the film maps a nuanced portrait of three sisters who, despite their differences—one blazing a trail at sea, one chasing stardom, and one tending to the end of life—discover that honesty, forgiveness, and a shared history can still hold them together. In the end, the bonds that bind Katherine, Victoria, and Georgina endure the storms of family life, and the women each find a path that honors both their individual identities and the love they share.
