Rating: Few things could be more dull, you'd think, than watching a man unpacking his weekly shopping. A complete stranger dusting family photographs in silence. Or a middle-aged woman putting on her make-up. But now imagine these people have lived with a crushing burden of guilt and grief for decades. For they are the parents of murderers: some of their teenage children committed multiple killings, walking into school with guns and opening fire indiscriminately. Suddenly, their parents' mundane activities seem almost miraculous. You wonder how anyone can carry on, finding the strength for years to perform everyday routines after such devastating events.