In 1956 Brooklyn, an aspiring playwright falls in love, her letters brimming with desire and ambition. Decades later, her granddaughter, a writer herself, uncovers them—tracing the arc of a love story cut short and a dream left unfinished. Between a Brooklyn summer alive with possibility and a present-day American diner steeped in nostalgia, past and present blur. She sits across from the man who once held her grandmother’s heart, wrestling with the choices that shaped two lives. Letters to Joan explores the dreams we chase, the ones we abandon, and the unshakable longing for the life that might have been.