For six months one time I rented a room in the massive London house of a psychiatrist who had just spent a year working for the UK government. Though he never went into detail about what it entailed, he intimated to me at times that he had made an absolute fortune in that period, which had enabled him to buy outright what was practically a mansion in one of the most expensive areas of one of the most expensive cities in the world.

Yet he hinted to me a couple of times that he was haunted by what he had done in that year. I shall always wonder!