Ellie Jerome is a young-at-heart seventy-five-year-old who feels she has more in common with her twenty-nine-year-old granddaughter, Lucy, than her fifty-five-year-old daughter, Barbara. Ellie's done everything she can to stay young, and the last thing she wants is to celebrate another birthday. So when she finds herself confronted with a cake full of candles, Ellie wishes more than anything that she could be twenty-nine again, just for one day. But who expects a wish like that to come true?