The Invisible Red Thread follows fifteen year old Vivian Lum from Canada to China to discover the land she was adopted from in 1995. She returns to her birth city and orphanage and also meets Shumin Zhu, a locally adopted teen girl. The girls compare lives as the film explores the ripple effects of China's Family Planning Policy. The Invisible Red Thread travels the twists of fate that brought these girls to very different worlds, and the ties that still connect Vivian to China.