It was Connie, as ever, who put an end to the suitably dreadful silence. Her smile was also the fastest - and the most knowing.

'He's smoking him out,' she whispered to them all

in ecstasy. 'Same as he did with Bill, the clever hound! Lighting a fire on his doorstep, aren't you, darling, and seeing which way he runs. Oh George, you lovely, lovely man, the best of all my boys, I do declare!'

Smiley's signal to Craw used a different metaphor to describe the plan, one which fieldmen favour. He referred to shaking Ko's tree, and it was clear from the remainder of the text that, despite the considerable dangers, he proposed to use the broad back of Jerry Westerby to do it.

As a footnote to all this, a couple of days later Sam Collins vanished. Everyone was very pleased. He ceased to come in and Smiley did not refer to him. His room, when Guillam sneaked in covertly to look it over, contained nothing personal to Sam at all except a couple of unbroken packs of playing cards and some garish book matches advertising a West End nightclub. When he sounded out the housekeepers, they were for once unusually forthcoming. His price was a kiss-off gratuity, they said, and a promise to have his pension rights reconsidered. He had not really had much to sell at all. A flash in the pan, they said, never to reappear. Good riddance.

All the same, Guillam could not rid himself of a certain unease about Sam, which he often conveyed to Molly Meakin over the next few weeks. It was not just about bumping into him at Lacon's office. He was bothered about the business of Smiley's exchange of letters with Martello confirming their verbal understanding. Rather than have the Cousins collect it, with the consequent parade of a limousine and even a motor-cycle outrider in Cambridge Circus, Smiley had ordered Guillam to run it round to Grosvenor Square himself with Fawn babysitting.

But Guillam was snowed under with work, as it happened, and Sam as usual was spare. So when Sam volunteered to take it for him, Guillam let him, and wished to God he never had. He wished it still, devoutly.

Because instead of handing George's letter to Murphy or his faceless running-mate, said Fawn, Sam had insisted on going in to Martello personally. And had spent more than an hour with him alone.