Errol Morris' latest Oscar-winning documentary is no Moore-style polemic but an artful interrogation of infamous US Defence Secretary Robert McNamara, who gave Morris 23 hours of filmed interviews in 2001, before 9/11 and the Iraq war, though unspoken parallels are hard to ignore. A formidable intellectual bruiser at 87, the old Cold Warrior seizes what may prove to be his last chance to make peace with history. Riveting.