In this fifth and final book in The Girls Who Changed the World series, Ming Qong discovers who she is, and that she, too, will change the world. Ming has travelled through history to meet girls who have changed the world. However, this time is different as Herstory, History's sister, promises to reveal to Ming something of her own her long-lost mother. When Ming washes up on the icy shores of Nantucket Island in 1836 she is saved by the elderly Mrs Sloe and the wealthy Miss Reynolds, but there is no sign of a woman who might be her mother. The island is home to Maria Mitchell, who at seventeen has already published her first papers on astronomy and will go on to inspire scientists around the world for generations to come. Maria's future holds extraordinary promise and fame. But what about Ming? And who is her mother? In this final book in the Girls Who Changed the World series, Ming Qong discovers who she is, and how she, too, will change the world.