As summer turns to autumn, music teacher Keith Reynolds (Guy Pearce) privately reminisces about his days as a starving artist in the city. While his wife, Megan (Amy Ryan), and Lauren (Mackenzie Davies), 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 (Felicity Jones), 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.