This is, as stated in the subtitle, a true story of a young girl's experiences growing up in Communist China. She was only a little girl, about four, when Mao came into power and began his endless, circular, campaigns. Life quickly became stressful and confusing, and even children learned how to keep their true thoughts to themselves and tout the party line.
Sansan's story is also one of discovery. She learns that she was given up by her real mother at the age of one; her parents left China so her father could take a job in the United States. By the time the family tried to reclaim their daughter, the rules and regulations of the People's Republic of China made it impossible for them to return or for her to leave. Part of her story is how she deals with this discovery, and how she finds a way to reconnect with her true family.