Ambitious high-flyer Nat and struggling writer Josh experience love at first sight during a lively party. Six months later, they tie the knot, despite the skepticism of their friends and some awkward moments, including an unfortunate best man's speech and a coughing priest. At work post-honeymoon, Nat finds herself embarrassed when Josh calls her during an important meeting, affectionately declaring how much he misses her. Their first meeting with a solicitor becomes a comedic mix-up when Josh tricks her into arriving early.
Hosting a dinner party to celebrate their wedding gifts unveils their differences, especially regarding their honeymoon stories. Confronted with the specter of Josh's unresolved feelings for his ex, Chloe, Nat grapples with her insecurities. Meanwhile, her sister Naomi faces her own marital struggles, made worse by her husband's annoying habits.
As Nat and her teammates prepare for a meeting with their new client, Guy Harrap, they inadvertently mock him without realizing he's right there. When Nat's wedding ring is stolen, her coworker believes it might boost their business chances by appearing single. The meeting unfolds with Guy initially playing into their stereotypes of an obnoxious American, only to reveal his true self, leaving the women embarrassed. Following their encounter, a romantic tension brews between Nat and Guy, ultimately leading to a dinner invitation that Nat declines.
As the story progresses, the subtle strains in Nat and Josh's relationship begin to surface. Little annoyances, from leaving the toilet seat up to mismatched song lyrics, start to take a toll. An uninvited dinner plans with Chloe complicate matters further as Josh finds himself caught in a series of awkward interactions with her. Heartfelt phone calls and shared moments draw them closer but make their respective partners suspicious.
During a chance meeting at a lingerie shop, sparks ignite when Chloe and Josh share an unexpected kiss while she seeks his help. The narrative frenzies as both couples find themselves intertwined at crucial moments, leading to comedic yet uncomfortable interactions filled with misunderstandings.
The delightful chaotic moments peak during a Christmas charades game, where Josh clumsily veers into inappropriate territory, only to be countered by Nat's sarcastic retorts. Meanwhile, uncomfortable reveals about family perceptions emerge, particularly when Josh presents evidence of disapproving gifts from Nat's family.
As tensions mount, Nat and Josh explore the dynamics of their relationship, ultimately reaching a breaking point leading them to seek help instead of surrendering. Months pass by, and as their anniversary approaches, a sense of hope flickers yet remains laced with uncertainty. Dealing with various expectations, they prepare for a celebratory dinner with friends and family, only for their revelations to lead to surprising conclusions.
In a twist of fate, just as Nat and Josh are about to cement their future, they find themselves at a junction, leading to confessions of love and desires for independence. Amidst fate's orchestrations, Nat seeks Guy, while Josh pursues Chloe, ultimately climaxing in a romantic entanglement that leaves both couples questioning their decisions. Amid laughter and tears, a series of unexpected endings unfold and embrace a vibrant exploration of love, marriage, and the intricate dance of relationships.
