 World War II has begun, but Parisian neighbors Dalban (biographer of Napoleon) and Mme. Ancelot still feud over his claim that her great- great-grandmother did *not* sleep with the Emperor! Their underage children Claire and Bernard are in love, but cannot marry over their parents  opposition. Dalban enlists beautiful cabaret star Zazu to divert Bernard s attention with a showgirl. But Zazu has her own ideas about young love...and strange things happen in air-raid shelters!