'He hadn't been standing there long when the Indian authorities arrested him at our request and carted him off to Delhi jail. As far as I remember we had promised the Indians a piece of the product. I think that was the deal,' he remarked, and like someone suddenly shocked by the faultiness of his own memory fell silent and looked distractedly down the steamy room. 'Or perhaps we said they could have him when we'd done with him. Dear oh dear.'

'It doesn't really matter,' Guillam said.

'For once in Karla's life, as I say, the Circus was ahead of him,' Smiley resumed, having taken a sip of wine and made a sour face. 'He couldn't know it but the San Francisco network which he had just serviced had been rolled up hide and hair the day he left for Delhi. As soon as Control had the story from the wranglers he traded it to the Americans on the understanding that they missed Gerstmann but hit the rest of the Rudnev network in California. Gerstmann flew on to Delhi unaware, and he was still unaware when I arrived at Delhi jail to sell him a piece of insurance, as Control called it. His choice was very simple. There could not be the slightest doubt, on present form, that Gerstmann's head was on the block in Moscow, where to save his own neck Rudnev was busy denouncing him for blowing the San Francisco network. The affair had made a great splash in the States and Moscow was very angry at the publicity. I had with me the American press photographs of the arrest; even of the radio set Karla had imported and the signal plans he had cached before he left. You know how prickly we all become when things get into the papers.'

Guillam did; and with a jolt remembered the Testify file which he had left with Mendel earlier that evening.

'To sum it up, Karla was the proverbial cold war orphan. He had left home to do a job abroad. The job had blown up in his face, but he couldn't go back: home was more hostile than abroad. We had no powers of permanent arrest, so it was up to Karla to ask us for protection. I don't think I had ever come across a clearer case for defection. I had only to convince him of the arrest of the San Francisco network - wave the press photographs and cuttings from my briefcase at him - talk to him a little about the unfriendly conspiracies of brother Rudnev in Moscow, and cable the somewhat overworked inquisitors in Sarratt, and with any luck I'd make London by the weekend. I rather think I had tickets for Sadlers Wells. It was Ann's great year for ballet.'

Yes, Guillam had heard about that too, a twenty-year-old Welsh Apollo, the season's wonder boy. They had been burning up London for months. The heat in the jail was appalling, Smiley continued. The cell had an iron table at the centre and iron cattle rings let into the wall. 'They brought him manacled, which seemed silly because he was so slight. I asked them to free his hands and when they did, he put them on the table in front of him and watched the blood come back. It must have been painful but he didn't comment on it. He'd been there a week and he was wearing a calico tunic. Red. I forget what red meant. Some piece of prison ethic.' Taking a sip of wine, he again pulled a face, then slowly corrected the gesture as the memories once more bore in upon him.

'Well, at first sight, he made little impression on me. I would have been hard put to it to recognise in the little fellow before me the master of cunning we have heard about in Irina's letter, poor woman. I suppose it's also true that my nerve-ends had been a good deal blunted by so many similar encounters in the last few months, by travel, and well, by - well, by things at home.'

In all the time Guillam had known him, it was the nearest Smiley had ever come to acknowledging Ann's infidelities.

'For some reason, it hurt an awful lot.' His eyes were still open but his gaze had fixed upon an inner world. The skin of his brow and cheeks was drawn smooth as if by the exertion of his memory; but nothing could conceal from Guillam the loneliness evoked by this one admission. 'I have a theory which I suspect is rather immoral,' Smiley went on, more lightly. 'Each of us has only a quantum of compassion. That if we lavish our concern on every stray cat, we never get to the centre of things. What do you think of it?'

'What did Karla look like?' Guillam asked, treating the question as rhetorical.

'Avuncular. Modest, and avuncular. He would have looked very well as a priest: the shabby, gnomic variety one sees in small Italian towns. Little wiry chap, with silvery hair, bright brown eyes and plenty of wrinkles. Or a schoolmaster, he could have been a schoolmaster: tough, whatever that means, and sagacious within the limits of his experience: but the small canvas, all the same. He made no other initial impression, except that his gaze was straight and it fixed on me from early in our talk. If you can call it a talk, seeing that he never uttered a word. Not one, the whole time we were together; not a syllable. Also it was stinking hot and I was travelled to death.'

Out of a sense of manners rather than appetite, Smiley set to work on his food, eating several mouthfuls joylessly before resuming his narrative. 'There,' he muttered, 'that shouldn't offend the cook. The truth is, I was slightly predisposed against Mr Gerstmann. We all have our prejudices and radio men are mine. They're a thoroughly tiresome lot in my experience, bad fieldmen and overstrung, and disgracefully unreliable when it comes down to doing the job. Gerstmann, it seemed to me, was just another of the clan. Perhaps I'm looking for excuses for going to work on him with less' - he hesitated - 'less care, less caution, than in retrospect would seem appropriate.' He grew suddenly stronger. 'Though I'm not at all sure I need make any excuses,' he said.

Here Guillam sensed a wave of unusual anger, imparted by a ghostly smile that crossed Smiley's pale lips. 'To hell with it,' Smiley muttered.

Guillam waited, mystified.

'I also remember thinking that prison seemed to have taken him over fast in seven days. He had that white dust in the skin and he wasn't sweating. I was, profusely. I trotted out my piece, as I had a dozen times that year already, except that there was obviously no question of his being played back into Russia as our agent. "You have the alternative. It's no one else's business but your own. Come to the West and we can give you, within reason, a decent life. After questioning, at which you are expected to co-operate, we can help you to a new start, a new name, seclusion, a certain amount of money. On the other hand you can go home and I suppose they'll shoot you or send you to a camp. Last month they sent Bykov, Shur and Muranov. Now why don't you tell me your real name?" Something like that. Then I sat back and wiped away the sweat and waited for him to say "Yes, thank you". He did nothing. He didn't speak. He simply sat there stiff and tiny under the big fan that didn't work, looking at me with his brown, rather jolly eyes. Hands out in front of him. They were very calloused. I remember thinking I must ask him where he had been doing so much manual labour. He held them - like this - resting on the table, palms upwards and fingers a little bent, as if he were still manacled.'

The boy, thinking that by this gesture Smiley was indicating some want, came lumbering over and Smiley again assured him that all was doubly well, and the wine in particular was exquisite, he really wondered where they had it from; till the boy left grinning with secret amusement and flapped his cloth at an adjoining table.

'It was then, I think, that an extraordinary feeling of unease began to creep over me. The heat was really getting to me. The stench was terrible and I remember listening to the pat pat of my own sweat falling on to the iron table. It wasn't just his silence; his physical stillness began to get under my skin. Oh, I had known defectors who took time to speak. It can be a great wrench, for somebody trained to secrecy even towards his closest friends suddenly to open his mouth and spill secrets to his enemies. It also crossed my mind that the prison authorities might have thought it a courtesy to soften him up before they brought him to me. They assured me they hadn't, but of course one can never tell. So at first I put his silence down to shock. But this stillness, this intense, watchful stillness, was a different matter. Specially when everything inside me was so much in motion: Ann, my own heartbeats, the effects of heat and travel...'

'I can understand,' said Guillam quietly.

'Can you? Sitting is an eloquent business, any actor will tell you that. We sit according to our natures. We sprawl and straddle, we rest like boxers between rounds, we fidget, perch, cross and uncross our legs, lose patience, lose endurance. Gerstmann did none of those things. His posture was finite and irreducible, his little jagged body was like a promontory of rock; he could have sat that way all day, without stirring a muscle. Whereas I-' Breaking out in an awkward, embarrassed laugh, Smiley tasted the wine again, but it was no better than before. 'Whereas I longed to have something before me, papers, a book, a report. I think I am a restless person; fussy, variable. I thought so then, anyway. I felt I lacked philosophic repose. Lacked philosophy, if you like. My work had been oppressing me much more than I realised; till now. But in that foul cell I really felt aggrieved. I felt that the entire responsibility for fighting the cold war had landed on my shoulders. Which was tripe, of course, I was just exhausted and a little bit ill.' He drank again.

'I tell you,' he insisted, once more quite angry with himself. 'No one has any business to apologise for what I did.'

'What did you do?' Guillam asked with a laugh.

'So anyway there came this gap,' Smiley resumed, disregarding the question. 'Hardly of Gerstmann's making, since he was all gap anyway; so of mine, then. I had said my piece; I had flourished the photographs, which he ignored - I may say, he appeared quite ready to take my word for it that the San Francisco network was blown. I restated this part, that part, talked a few variations, and finally I dried up. Or rather sat there sweating like a pig. Well any fool knows that if ever that happens, you get up and walk out: "Take it or leave it," you say. "See you in the morning"; anything. "Go away and think for an hour."

'As it was, the next thing I knew I was talking about Ann.' He left no time for Guillam's muffled exclamation. 'Oh not about my Ann, not in as many words. About his Ann. I assumed he had one. I had asked myself, lazily no doubt, what would a man think of in such a situation, what would I? And my mind came up with a subjective answer: his woman. Is it called projection or substitution? I detest those terms but I'm sure one of them applies. I exchanged my predicament for his, that is the point, and as I now realise I began to conduct an interrogation with myself - he didn't speak, can you imagine? There were certain externals, it is true, to which I pinned the approach. He looked connubial; he looked like half a union; he looked too complete to be alone in all his life. Then there was his passport, describing Gerstmann as married; and it is a habit in all of us to make our cover stories, our assumed personae, at least parallel with the reality.' He lapsed again into a moment of reflection. 'I often thought that. I even put it to Control: we should take the opposition's cover stories more seriously, I said. The more identities a man has, the more they express the person they conceal. The fifty-year-old who knocks five years off his age. The married man who calls himself a bachelor; the fatherless man who gives himself two children... Or the interrogator who projects himself into the life of a man who does not speak. Few men can resist expressing their appetites when they are making a fantasy about themselves.'