'It was probably in one of the corridors that the thing came up. Most treacherous business was done in the university corridors. Most business, indeed. Indeed most university business was probably treacherous. You would be walking along, blinking in the gloom, the memory of the bright sun still imprinted on your retina, and somebody would sidle out of a room and catch you off guard. I should have been on guard, it happened so often. But I wasn’t. These were still the innocent years, the naive years, the sun shone brightly outside, no one worried about skin cancer, the gloomy corridors were just the price you paid to pay your way, they were not something you thought about.' (Introduction)