To possess another language, Charlemagne tells us, is to possess another soul. German is such a language. Once you have it in your head, you can go there anytime, you can close the door, you have a refuge.

The Spy Who Came in from the Cold was the work of a wayward imagination brought to the end of its tether by political disgust and personal confusion. Fifty years on, I don't associate the book with anything that ever happened to me, save for one wordless encounter at London airport when a worn-out, middle-aged military kind of man in a stained raincoat slammed a handful of mixed foreign change on to the bar and in gritty Irish accents ordered himself as much Scotch as it would buy. In that moment, Alec Leamas was born. Or so my memory, not always a reliable informant, tells me.

By the age of 9 or 10, I knew that I had to cut my own cloth and make my own way.

Agents of disruption, subversion, sabotage and disinformation tunnelers and smugglers, listeners and forgers, trainers and recruiters and talent spotters and couriers and watchers and seducers, assassins and balloonists, lip readers and disguise artists.

If you see the world as gloomily as I see it, the only thing to do is laugh or shoot yourself.

Thank heaven, though, one of the few mistakes I haven't made is to talk about the unwritten book.

Home's where you go when you run out of homes.