‘Who’s that?’ I asked James. ‘Essi Viding,’ he said. ‘What does she study?’ I asked. ‘Psychopaths,’ said James. I peered in at Essi. She spotted us, smiled and waved. ‘That must be dangerous,’ I said. ‘I heard a story about her once,’ said James. ‘She was interviewing a psychopath. She showed him a picture of a frightened face and asked him to identify the emotion. He said he didn’t know what the emotion was but it was the face people pulled just before he killed them.’
