In a town like London there are always plenty of not quite certifiable lunatics walking the streets, and they tend to gravitate towards bookshops, because a bookshop is one of the few places where you can hang about for a long time without spending any money. In the end one gets to know these people almost at a glance. For all their big talk there is something moth-eaten and aimless about them. Very often, when we were dealing with an obvious paranoiac, we would put aside the books he asked for and then put them back on the shelves the moment he had gone. None of them, I noticed, ever
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