The video was seemingly everywhere on the Chinese internet: A middle-aged woman standing in a doorless brick shack, a dazed expression on her face, wearing no coat though it was the middle of winter. Around her neck was a metal chain, shackling her to the wall. The brief clip, posted by a blogger on Douyin, China’s version of TikTok, raised many questions, and social media users demanded answers. Who was she? Why was she locked up? And under what circumstances had she given birth to the eight children living in…