Four demonic figures slipped silently through the crowd. I blinked and three were gone, lost in the darkness, but I could still see one heading my way. Then I realised that the trap was already set — the others had split off to surround me. There was nowhere to run. I was like a wounded gazelle, cut off from the herd. Except the creatures stalking me were not lions or cheetahs. They were not of this world. They were teenage girls.