Dounia, a grandmother, tells her granddaughter the story even her son has never heard: how, as a young Jewish girl in Paris, she was hidden away from the Nazis by a series of neighbors and friends who risked their lives to keep her alive when her parents had been taken to concentration camps. Hidden ends on a tender note, with Dounia and her mother rediscovering each other as World War II ends . . . and a young girl in present-day France becoming closer to her grandmother, who can finally, after all those years, tell her story.