Maizy always assumed she knew everything about her grandmother, Jacuzzi. So when a box full of vintage Nancy Drew books gets left at her mom's thrift store, Maizy is surprised to find an old photo of her grandmother and two other women tucked beneath the collection. Stranger still, when Maizy shows the photo to Jacuzzi she feigns ignorance, insisting the woman is someone else. Determined to learn the truth -- and inspired by the legacy of Nancy Drew -- Maizy launches her own investigation with the help of new friends, Nell and Cam. What they discover not only points to the origins of the iconic series, but uncovers a truth from the past that will lead to self-discovery in the present, connecting three generations of women.