'For many Australians, facing the reality of this country is a task that has proved enduringly difficult, both at a public and a political level. For investigative journalist David Marr, finding the right way to tell the stories that allow us to see the truth of our history is a personal quest and one that has led to his latest book. This week, Michael talks with David about shame – both personal and national – and why his family agreed that he had to write Killing for Country.'