The killings organised by the Khmer Rouge stand as one of the greatest crimes of the twentieth century. One of its key architects was Nuon Chea - Brother Number Two. In this film he and some of those involved in the day-to-day killing are interviewed, and the wider impact is examined. Members of director Thet Sambath’s family were killed, a fact he initially hides from Chea. When the filmmakers refused to make the rushes available in Chea's trial, citing journalistic responsibility to their source, the film became the subject of intense debate.