The word “plague” had just been uttered for the first time. At this stage of the narrative, with Dr. Bernard Rieux standing at his window, the narrator may, perhaps, be allowed to justify the doctor’s uncertainty and surprise – since, with very slight differences, his reaction was the same as that of the majority of the townsfolk. Everybody knows that pestilences have a way of recurring in the world; yet somehow we find it hard to believe in ones that crash down on our heads from a blue sky. There have been as many plagues as wars in history; yet always plagues and wars take people equally by surprise.