It was a summer morning in 1982 when soldiers entered the village of Chupan Ya Twenty years later, Dr Temperance Brennan, forensic anthropologist, travels to Guatemala to work on one of the most heartbreaking cases of her career Twenty-three women and children are said to lie where Tempe and a team from the Guatemalan Forensic Anthropology Foundation must search for remains It's one of five mass graves No records were kept Families and neighbours refer to their lost members as 'the disappeared'