In a serene upstate New York town, Keith Reynolds, a high school music teacher and former musician, leads a seemingly idyllic life with his wife Megan and daughter Lauren. Despite his comfortable existence, Keith harbors unfulfilled dreams of returning to his music career in New York City, a tension that underscores his everyday life. The family's dynamic begins to change with the arrival of Sophie, a British foreign exchange student who comes to stay with them. Sophie's presence introduces a new energy into the household, as she shares a profound passion for music, particularly the piano, which she plays exquisitely, reigniting Keith's own musical aspirations.

Sophie's talent and vitality quickly make her a beloved member of the family, especially endearing herself to Keith through their shared love for music. However, as Keith and Sophie spend more time together, including private piano lessons, their connection deepens into something more, straining the familial bonds. Their burgeoning relationship is fraught with the tension of forbidden emotions and the threat it poses to the stability of Keith's marriage and family life. The interplay of personal desires, family loyalty, and the pursuit of artistic fulfillment creates a complex web of relationships, setting the stage for transformative decisions that will affect everyone involved.