Yan Sichun, a provincial forestry engineer, has been trapped deep in the mountains of Suoyun'ao for ten whole years. In a dark, windowless woodshed, she secretly teaches her son and daughter to remember their names and identities. She hides her work ID badge in her daughter's shoe, while her ten-year-old son risks his life to arrange stones on a cliff in the shape of the Big Dipper. On a night of torrential rain and flash floods, the mother and children make a desperate escape. To help their mother get out and seek rescue, the siblings draw the entire village's pursuers away at the cost of their own safety. Yan Sichun narrowly survives her escape from the mountains and returns with the full force of the public security authorities. Justice will eventually dawn. After enduring an endless night, they will finally head north toward the brilliant starlight that belongs to them.