Richard Haig's heartfelt conversation with his young son Jakey sets the stage for a shocking revelation that will upend his world. As he reflects on his troubled upbringing, it becomes evident that Richard has mirrored the infidelities of his university professor father, becoming embroiled in numerous fleeting romantic escapades that have left many hearts shattered.
Among these brief liaisons is Kate, a stunning 25-year-old American beauty who has caught Richard's eye. Little does he understand that destiny has different plans for him. On the night he is scheduled to meet Kate and her father at a hotel bar, he finds himself inexplicably drawn to another alluring woman, only to be taken by surprise with the unexpected arrival of Olivia – Kate's sister and a newfound acquaintance.
As Richard and Olivia engage in conversation, it quickly becomes apparent that these sisters share more than just striking looks; they are the result of a secret polygamous union built on a foundation of total honesty and unwavering trust. During their discussion of complex family ties, Olivia shares that Kate views Richard as a father figure, which triggers a series of events that will profoundly change his life.
The news of Kate's pregnancy serves as a powerful catalyst for Richard's awakening sense of responsibility. He begins to reassess his priorities, promising to leave behind his wandering ways. This leads him to propose marriage and relocate to Los Angeles, where he finds himself in a lackluster job at a community college, teaching students who seem indifferent to their studies.
In a flash forward, we see Jakey, now older, witnessing the fallout from Richard's recent choices. Struggling with dental pain from an incident involving his son, Richard is prescribed medication that warns against alcohol. Despite the warnings, he finds himself at a gathering where he indulges in drinks, leading to erratic behavior. The inevitable consequence is a police stop that results in his license being revoked.
Simultaneously, Olivia faces her own turmoil as she uncovers her husband Alan's infidelity. In a show of sisterly support, Kate invites Olivia to stay with them, offering assistance in caring for Jakey while she takes a four-day trip with Brian. As Richard grapples with his new reality, he navigates a complex web of emotions and responsibilities, all while attending mandatory AA meetings critical to his immigration status and self-identity.
As Richard and Olivia share time caring for Jakey, an underlying spark ignites between them, driven by her appreciation for his fatherly instincts and his uncertainties about her relationship with Tim, her publisher. Their mutual attraction simmers dangerously close to the surface, leading to a night of heated passion in the pool house.
The unexpected return of Kate and Brian throws them into confusion. To cover her tracks, Olivia opts for a midnight swim, pretending to indulge in spontaneous skinny-dipping. Meanwhile, Richard remains apparently unfazed by the surprise visit until a familiar face appears: his estranged father, a profound surprise to everyone present, including his ex-daughter-in-law and grandson.
After completing his tenth AA meeting, Richard faces disappointment when the coordinator denies him certification, citing a lack of sincere remorse. Determined to change course, he ventures into an unorthodox approach during a lecture for his uninterested students. Mistakenly believing he has failed, he leaves a defeated voicemail for his father but soon receives an unexpected job offer from the ULA representative.
Elated and feeling validated, Richard rushes home to share his newfound joy and allusions to his intimacy with Olivia, oblivious to the fact that Brian and Kate have overheard every intimate detail. The repercussions are swift; Kate refuses to support him in his immigration interview, leading to the rejection of his deportation case.
As the moment arrives to explain his situation with Jakey, Richard and his son face an emotional farewell before he embarks on his journey back to the UK to resume lecturing. A hospital visit from Robert later offers hopeful encouragement when Richard learns of his father's dying wish for him to pursue Olivia, a woman he has grown to admire for her steadfastness.
The stipulations in the will demand that Richard's father be interred in LA, prompting him to sneak back to mend fences with Kate. The family later gathers at Olivia’s book launch, where the sisters finally reconcile. After scattering his father's ashes, Richard embarks on a courageous journey, proposing to Olivia, ushering in a fresh chapter in their intricate yet deeply passionate bond.
