In April 1977 a group of women in Argentina held the first ever public demonstration to demand the release of thousands of opponents of the military regime. It was the start of a long campaign by the women, who became known as the Mothers of the Plaza de Mayo. Mike Lanchin has been hearing from ninety-two year-old Mirta Baravalle who has spent decades searching for her missing daughter and son-in-law, and for the grandchild she has never met.(Photo: Mirta Baravalle, with the black-and-white photograph of her daughter, Ana Maria)