On the night of 26 September 2014, 43 students disappeared in Mexico. Since then, their families have been trying desperately, but unsuccessfully, to find out what happened to them. Ai Weiwei’s film focuses on the families and survivors, but points to a much more serious problem — the tens of thousands of people who have disappeared in Mexico without a trace. In the background we see the conscious neglect of the authorities, systemic injustice and police violence, while the film patiently and meticulously puts together the puzzle pieces. The families, helpless in the face of the abuse of power, struggle against the emotional burden of disappearances through collective protest, organizing demonstrations and mutual support.