When Rosemary receives ten mysterious packages from her grandmother on her tenth birthday, she is excited. She is so excited that she doesn't heed her grandmother's warning to wait to open the last package, and she is whisked back in time to Germany in 1870. Will she ever make it home? What will happen when she meets her great-great-great grandmother Rosemarie as a girl her own age? Will she be able to decode a mysterious postcard Rosemarie receives?