Introduces viewers to 10-year-old YingYing, 6-year-old Zhenzhen and 4-year-old Fenfen, who live alone in Xiyangtang, a tiny rural village in the high mountains of China's Yunnan province. Their father is away working in the city; their mother left the family long ago. The girls help their grandfather or aunt in exchange for meals. They spend their days at grueling tasks: herding sheep, goats and pigs, searching for firewood, collecting dung. Games are few and far between. The eldest, Yingying, is her sisters' primary caretaker, shouldering responsibilities far beyond her years.