The machine acknowledges the order but sounds unwilling, and she knows why. At this time of night, the flood of people departing the central London leisure area is at its height, and the number already on the station will be in the tens of thousands. Ventilation and temperature control will rapidly become an issue. Under the wrong circumstances the closure could turn into a panic. How desperate is Lönnrot? How mad? Mad enough to shout "fire" or "bomb"? Surely, yes. If Lönnrot killed Smith, conventional perceptions of violent insanity may not touch what is behind the smile.