After 31 years of marriage, Kay and Arnold have drifted apart, sleeping in separate rooms. Despite Kay's attempts to reignite their intimacy, Arnold seems uninterested, and their lives in Omaha have settled into a monotonous routine. Instead of heartfelt gifts, they find themselves gifting each other with mundane items like a new cable TV package for their anniversary. While Kay juggles responsibilities at home and her job at a clothing boutique, Arnold continues to work as an accountant, both feeling the distance that has grown between them, made more pronounced by their seemingly detached grown children.
Determined to salvage their marriage, Kay discovers a self-help book by Dr. Feld, a marriage therapist based in Maine. With hope in her heart, Kay books a week-long therapy retreat—an investment in their relationship. When she shares this news with Arnold, he staunchly refuses to attend. In a misguided effort to cheer her up, he gifts her cheap earrings and flowers, but Kay remains unimpressed. She urges him to reconsider the trip, pointing out that his lack of physical interest and reluctance to communicate puts their marriage at risk.
Eventually, after deep reflection, Arnold concedes to join her. They arrive at the charming coastal town of Great Hope Springs and check into a modest hotel, though Arnold insists on sleeping in a pull-out bed apart from Kay. On the first day of therapy with Dr. Feld, Arnold displays resistance, deeming their relationship "adequate" and dismissing the need for help, while Kay expresses her yearning to revive their connection. Arnold is visibly uncomfortable when Kay reveals the lack of affection and intimacy in their marriage, prompting Dr. Feld to suggest they undertake some hard work to address these issues.
As sessions unfold, the couple begins to unpack their past, reminiscing about their college days and how they ended up sleeping separately due to Arnold’s back injury. While Kay can pinpoint the exact date they last had sex over four years ago, Arnold struggles to recall it. Dr. Feld pushes them to engage in intimate exercises, but Arnold balks at the assignments, claiming that the therapy is not worth the expense and feels futile.
After a particularly challenging session, Kay seeks solace in a local bar, where she confides in the bartender about the dissatisfaction in her marriage. Meanwhile, Arnold finds distraction in a nearby museum. The therapy continues to unveil long-buried emotions, leading to a mix of frustration and tentative steps towards reconnecting. One morning, as the couple lays down together, they cautiously embrace, signifying a glimmer of progress.
Dr. Feld encourages them to confront deeper aspects of their sexual lives. Conversations become more intimate yet uncomfortable, exploring their fantasies and memories. Kay expresses her longing for a renewed sexual spark, leading to an assignment that involves a movie date where she attempts to initiate intimacy. The situation becomes awkward, and they both leave feeling disheartened.
In a particularly poignant session, they reflect on their history of intimacy, with Kay revealing a cherished memory of a passionate encounter. Arnold shares that somewhere along the line, he has lost the desire that once fueled their connection. As they navigate these tumultuous emotions, Dr. Feld prescribes Kay a book on sexual tips and urges Arnold to consider how he might contribute to Kay's happiness.
In a significant moment of reflection, Arnold surprises Kay with a romantic dinner, reminding her of their early love. This culminates in a heartfelt night where they attempt to rekindle their passion in front of a cozy fire. However, Arnold’s insecurities surface as he pulls away once again, leading Kay to question his affection for her.
Despite their efforts to reconnect, they return home to find themselves slipping back into old habits, continuing to live in separate spheres. Kay packs her bags, contemplating a break, while Arnold strives to reassure her of their status quo. Yet a night of unexpected reconciliation ensues, reigniting warmth between them.
As the credits roll, Dr. Feld joyfully officiates as Kay and Arnold take significant steps to renew their vows at the beach, pledging to rekindle their deep love and commitment, ready to embrace the changes they each desire. The film ends on a high note, with joyful memories shared amid family, as the couple celebrates their journey forward surrounded by loved ones.
