Finally Jim began measuring. That at least was how it seemed to Roach. Instead of digging he had knelt at one corner of the patch and laid the spade on the earth, as if aligning it with something which was out of sight to Roach: for instance the church spire. This done. Jim strode quickly to where the blade lay, marked the spot with a thud of his heel, took up the spade and dug fast, Roach counted twelve times; then stood back, taking stock again. From the church, silence; then prayers. Quickly stooping, Jim drew a package from the ground, which he at once smothered in the folds of his duffel coat. Seconds later, and much faster than seemed possible, the caravan door slammed, the light went on again, and in the boldest moment of his life Bill Roach tiptoed down the Dip to within three feet of the poorly curtained window, using the slope to give himself the height he needed to look in.

Jim stood at the table. On the bunk behind him lay a heap of exercise books, a vodka bottle and an empty glass. He must have dumped them there to make space. He had a penknife ready but he wasn't using it. Jim would never have cut string if he could avoid it. The package was a foot long and made of yellowy stuff like a tobacco pouch. Pulling it open, he drew out what seemed to be a monkey wrench wrapped in sacking. But who would bury a monkey wrench, even for the best car England ever made? The screws or bolts were in a separate yellow envelope; he spilled them on to the table and examined each in turn. Not screws: pen tops. Not pen tops either; but they had sunk out of sight.

And not a monkey wrench, not a spanner, nothing but absolutely nothing for the car. Roach had blundered wildly to the brow. He was running between the hummocks, making for the drive, but running slower than he had ever run before; running through sand and deep water and dragging grass, gulping the night air, sobbing it out again, running lopsidedly like Jim, pushing now with this leg, now with the other, flailing with his head for extra speed. He had no thought for where he was heading. All his awareness was behind him; fixed on the black revolver and the bands of chamois leather; on the pen tops that turned to bullets as Jim threaded them methodically into the chamber, his lined face tipped towards the lamplight, pale and slightly squinting in the dazzle.

'I won't be quoted, George,' the Minister warned in his lounging drawl. 'No minutes, no packdrill. I got voters to deal with. You don't. Nor does Oliver Lacon, do you, Oliver?'

He had also, thought Smiley, the American violence with auxiliary verbs: 'Yes, I'm sorry about that,' he said.

'You'd be sorrier still if you had my constituency,' the Minister retorted.

Predictably, the mere question of where they should meet had sparked a silly quarrel. Smiley had pointed out to Lacon that it would be unwise to meet at his room in Whitehall since it was under constant attack by Circus personnel, whether janitors delivering despatch boxes or Percy Alleline dropping in to discuss Ireland. Whereas the Minister declined both the Islay Hotel and Bywater Street on the arbitrary grounds that they were insecure. He had recently appeared on television and was proud of being recognised. After several more calls back and forth they settled for Mendel's semi- detached Tudor residence in Mitcham where the Minister and his shiny car stuck out like a sore thumb. There they now sat, Lacon, Smiley and the Minister, in the trim front room with net curtains and fresh salmon sandwiches, while their host stood upstairs watching the approaches. In the lane, children tried to make the chauffeur tell them who he worked for.

Behind the Minister's head ran a row of books on bees. They were Mendel's passion, Smiley remembered: he used the word 'exotic' for bees that did not come from Surrey. The Minister was a young man still, with a dark jowl that looked as though it had been knocked off-true in some unseemly fracas. His head was bald on top, which gave him an unwarranted air of maturity, and a terrible Eton drawl. 'All right, so what are the decisions?' He also had the bully's art of dialogue.

'Well first, I suppose, you should damp down whatever recent negotiations you've been having with the Americans. I was thinking of the untitled secret annexe which you keep in your safe,' said Smiley, 'the one that discusses the further exploitation of Witchcraft material.'

'Never heard of it,' said the Minister.

'I quite understand the incentives, of course; it's always tempting to get one's hands on the cream of that enormous American service, and I can see the argument for trading them Witchcraft in return.'

'So what are the arguments against?' the Minister enquired as if he was talking to his stockbroker.

'If the mole Gerald exists,' Smiley began. Of all her cousins, Ann had once said proudly, only Miles Sercombe was without a single redeeming feature. For the first time, Smiley really believed she was right. He felt not only idiotic but incoherent. 'If the mole exists, which I assume is common ground among us.' He waited, but no one said it wasn't. 'If the mole exists,' he repeated, 'it's not only the Circus which will double its profits by the American deal. Moscow Centre will too, because they'll get from the mole whatever you buy from the Americans.'

In a gesture of frustration the Minister slapped his hand on Mendel's table, leaving a moist imprint on the polish.

'God damn it I do not understand,' he declared. 'That Witchcraft stuff is bloody marvellous! A month ago it was buying us the moon. Now we're disappearing up our orifices and saying the Russians are cooking it for us. What the hell's happening?'

'Well, I don't think that's quite as illogical as it sounds as a matter of fact. After all, we've run the odd Russian network from time to time, and though I say it myself we ran them rather well. We gave them the best material we could afford. Rocketry, war planning. You were in on that yourself - this to Lacon, who threw a jerky nod of agreement. 'We tossed them agents we could do without, we gave them good communications, safed their courier links, cleared the air for their signals so that we could listen to them. That was the price we paid for running the opposition - what was your expression? - "for knowing how they briefed their commissars". I'm sure Karla would do as much for us if he was running our networks. He'd do more, wouldn't he, if he had his eye on the American market too?' He broke off and glanced at Lacon. 'Much, much more. An American connection, a big American dividend I mean, would put the mole Gerald right at the top table. The Circus too by proxy of course. As a Russian, one would give almost anything to the English if... well, if one could buy the Americans in return.'

'Thank you,' said Lacon quickly.

The Minister left, taking a couple of sandwiches with him to eat in the car and failing to say goodbye to Mendel, presumably because he was not a constituent.

Lacon stayed behind. 'You asked me to look out for anything on Prideaux,' he announced at last. 'Well I find that we do have a few papers on him after all.'

He had happened to be going through some files on the internal security of the Circus, he explained, 'Simply to clear my decks.' Doing so, he had stumbled on some old positive vetting reports. One of them related to Prideaux.

'He was cleared absolutely, you understand. Not a shadow. However,' - an odd inflexion of his voice caused Smiley to glance at him - 'I think it might interest you all the same. Some tiny murmur about his time at Oxford. We're all entitled to be a bit pink at that age.'

'Indeed yes.'

The silence returned, broken only by the soft tread of Mendel upstairs.

'Prideaux and Haydon were really very close indeed, you know,' Lacon confessed. 'I hadn't realised.'

He was suddenly in a great hurry to leave. Delving in his briefcase, he hauled out a large plain envelope, thrust it into Smiley's hand and went off to the prouder world of Whitehall; and Mr Barraclough to the Islay Hotel, where he returned to his reading of Operation Testify.

It was lunchtime next day. Smiley had read and slept a little, read again and bathed and as he climbed the steps to that pretty London house he felt pleased because he liked Sam.

The house was brown brick and Georgian, just off Grosvenor Square. There were five steps and a brass doorbell in a scalloped recess. The door was black with pillars either side. He pushed the bell and he might as well have pushed the door, it opened at once. He entered a circular hallway with another door the other end, and two large men in black suits who might have been ushers at Westminster Abbey. Over a marble chimney piece horses pranced and they might have been Stubbs. One man stood close while he took off his coat; the second led him to a bible desk to sign the book.

'Hebden,' Smiley murmured as he wrote, giving a workname Sam could remember. 'Adrian Hebden.'

The man who had his coat repeated the name into a house telephone: 'Mr Hebden, Mr Adrian Hebden.'

'If you wouldn't mind waiting one second, sir,' said the man by the bible desk. There was no music and Smiley had the feeling there should have been; also a fountain.

'I'm a friend of Mr Collins as a matter of fact,' said Smiley. 'If Mr Collins is available. I think he may even be expecting me.'

The man at the telephone murmured Thank you' and hung it on the hook. He led Smiley to the inner door and pushed it open. It made no sound at all, not even a rustle on the silk carpet.

'Mr Collins is over there, sir,' he murmured respectfully. 'Drinks are with the courtesy of the house.'

The three reception rooms had been run together, with pillars and arches to divide them optically, and mahogany panelling. In each room was one table, the third was sixty feet away. The lights shone on meaningless pictures of fruit in colossal gold frames, and on the green baize tablecloths. The curtains were drawn, the tables about one third occupied, four or five players to each, all men, but the only sound was the click of the ball in the wheel, and the click of chips as they were redistributed, and the very low murmur of the croupiers.

'Adrian Hebden,' said Sam Collins, with a twinkle in his voice. 'Long time no see.'

'Hullo, Sam,' said Smiley and they shook hands.

'Come to my lair,' said Sam and nodded to the only other man in the room who was standing, a very big man with blood pressure and a chipped face. The big man nodded too.

'Care for it?' Sam enquired as they crossed a corridor draped in red silk.

'It's very impressive,' said Smiley politely.

'That's the word,' said Sam. 'Impressive. That's what it is.' He was wearing a dinner jacket. His office was done in Edwardian plush, his desk had a marble top and ball-and-claw feet, but the room itself was very small and not at all well ventilated, more like the back room of a theatre, Smiley thought, furnished with left-over props.