Madeleine is trapped by her family's expectations, by her controlling husband, and by her own fears in an unhappy marriage and a life she never wanted. From the outside, it looks like she has everything, but on the inside, she fears she has nothing that matters. In Madeleine's memories, her grandmother Margie is the kind of woman she should have been elegant, reserved, perfect. But when Madeleine finds a diary detailing Margie's bold, romantic trip to Jazz Age Paris, she meets the grandmother she never knew: a dreamer who defied her strict, staid family and spent an exhilarating summer writing in cafes, living on her own, and falling for a charismatic artist. Despite her unhappiness, when Madeleine's marriage is threatened, she panics, escaping to her hometown and staying with her critical, disapproving mother. In that unlikely place, shaken by the revelation of a long-hidden family secret and inspired by her grandmother's bravery, Madeleine creates her own Parisian summer.