As summer turns to fall, music teacher Keith Reynolds privately reminisces about his days as a starving artist in the city. While his wife, Megan, and daughter, Lauren, look forward to Lauren's final year of high school, Keith clings to those evenings he's called on to sub as a cellist with a prestigious Manhattan symphony. Megan decides the family should host a foreign exchange student. Sophie, a British high school senior, settles in comfortably, but soon challenges the family dynamics. She reinvigorates the impulsiveness of Keith's personality which ultimately pushes their seemingly perfect family into unfamiliar territory.