My Old Lady Lady tells the story of Mathias Gold (Kevin Kline), a down-and-out New Yorker who travels to Paris to liquidate a huge and valuable apartment he has inherited from his estranged father. When he reaches his apartment in Paris he finds Mathilde Girard (Maggie Smith), a refined old lady living in the apartment with her daughter, Chloe (Kristin Scott Thomas). He then discovers the romantic history between Mathilde and his father, a romance that lasted over half a century...