This is what storytellers do. They create moments of unexpected change that seize the attention of their protagonists and, by extension, their readers and viewers. Those who’ve tried to unravel the secrets of story have long known about the significance of change. Aristotle argued that ‘peripeteia’, a dramatic turning point, is one of the most powerful moments in drama, whilst the story theorist and celebrated commissioner of screen drama John Yorke has written that ‘the image every TV director in fact or fiction always looks for is the close-up of the human face as it registers change.’
