In 1972, at the height of the Troubles, the Irish Republican Army allowed an American TV crew to film its members as they engaged in weapons training, patrols, gun battles and bombing missions across Northern Ireland. The operations were real, not staged, and senior commanders appeared on camera without concealment. The TV crew shadowed one unit as it packed a car with explosives, drove it into the centre of Derry and detonated the bomb, injuring 26 people. Europe’s deadliest guerrilla force had declared 1972 the year of victory and wanted it captured on film. The result was a propaganda documentary,...