Damaged people are dangerous: they know they can survive. The motif of Josephine Hart‘s 1991 novel Damage could well describe the essence of Charles Spencer – damaged and dangerous. Indeed, it could apply to each in the preternatural triangulation of the two Charleses and Diana. The trouble was one didn’t survive. As a result, a toxic cloud, 29 years after Diana’s death, still hangs over the royal family. And Spencer’s book Swan Song has come along to add a bane like a firebomb at an RAF airbase. There are three killer lines in the book, as the whole world knows…