'That is why I am asking you to move with the greatest possible circumspection. Bonn is a village,' Bradfield continued. 'It has the manners, vision and dimensions of the parish pump, and yet it is a State within a village. Nothing matters for us more than the confidence of our hosts. There are already indications that we have caused them offence. I do not even know how we have done that. Their manner, even in the last forty-eight hours, has become noticeably cool. We are under surveillance; our telephone calls are interrupted; and we have the greatest difficulty in reaching even our official ministerial contacts.'

'All right,' Turner said. He had had enough. 'I've got the message. I'm warned off. We're on tender ground. Now what?'

'Now this,' Bradfield snapped.

'We both know what Harting may be, or may have been. God knows, there are precedents. The greater his treachery here, the greater the potential embarrassment, the greater the shock to German confidence. Let us take the worst contingency. If it were possible to prove - I am not yet saying that it is, but there are indications - if it were possible to prove that by virtue of Harting's activities in this Embassy, our inmost secrets had been betrayed to the Russians over many years - secrets which to a great extent we share with the Germans - then that shock, trivial as it may be in the long term, could sever the last thread by which our credit here hangs. Wait.' He was sitting very straight at his desk, with an expression of controlled distaste upon his handsome face. 'Hear me out. There is something here that does not exist in England. It is called the anti-Soviet alliance. The Germans take it very seriously, and we deride it at our peril: it is still our ticket to Brussels. For twenty years or more, we have dressed ourselves in the shining armour of the defender. We may be bankrupt, we may beg for loans, currency and trade; we may occasionally... reinterpret... our Nato commitments; when the guns sound, we may even bury our heads under the blankets; our leaders may be as futile as theirs.'

What was it Turner discerned in Bradfield's voice at that moment? Self-disgust? A ruthless sense of his own decline? He spoke like a man who had tried all remedies, and would have no more of doctors. For a moment the gap between them had closed, and Turner heard his own voice speaking through the Bonn mist.

'For all that, in terms of popular psychology, it is the one great unspoken strength we have: that when the Barbarians come from the East, the Germans may count on our support. That Rhine Army will hastily gather on the Kentish hills and the British independent nuclear deterrent will be hustled in to service. Now do you see what Harting could me an in the hands of a man like Karfeld?'

Turner had taken the black notebook from his inside pocket. It crackled sharply as he opened it. 'No. I don't. Not yet. You don't want him found, you want him lost. If you had your way you wouldn't have sent for me.' He nodded his large head in reluctant admiration. 'Well, I'll say this for you: no one's ever warned me off this early. Christ, I've hardly sat down. I hardly know his full names. We've not heard of him in London, did you know that? He's not even had any access, not in our book. Not even one bloody military manual. He may have been abducted. He may have gone under a bus, run off with a bird for all we know. But you; Christ! You've really gone the bank, haven't you? He's all the spies we've ever had rolled in to one. So what has he pinched?

What do you know that I don't?' Bradfield tried to interrupt but Turner rode him down implacably. 'Or may be I shouldn't ask? I me an I don't want to upset anyone.'

They were glaring at one another across centuries of suspicion: Turner clever, predatory and vulgar, with the hard eye of the upstart; Bradfield disadvantaged but not put down, drawn in upon himself, picking his language as if it had been made for him.

'Our most secret file has disappeared. It vanished on the same day that Harting left. It covers the whole spectrum of our most delicate conversations with the Germans, formal and informal, over the last six months. For reasons which do not concern you, its publication would ruin us in Brussels.'

He thought at first that it was the roar of the aeroplane engines still ringing in his ears, but the traffic in Bonn is as constant as the mist. Gazing out of the window he was suddenly assailed by the feeling that from now on he would neither see nor hear with clarity; that his senses were being embraced and submerged by the cloying heat and the disembodied sound. 'Listen.' He indicated his canvas bag. 'I'mthe abortionist. You don't want me but you've got to have me. A neat job with no aftermath, that's what you're paying for. All right; I'll do my best. But before we all go over the wall, let's do a bit of counting on our fingers, shall we?'

The catechism began.

'He was unmarried?' 'Yes.' 'Always has been?' 'Yes.' 'Lived alone?' 'So far as I know.' 'Last seen?' 'On Friday morning, at the Chancery meeting. In here.' 'Not afterwards?' 'I happen to know the pay clerk saw him, but I'm limited in whom I can ask.'

'Anyone else missing at all?'

'No one.'

'Had a full count have you? No little long-legged bird from Registry?'

'People are constantly on leave; no one is unaccountably absent.'

'Then why didn't Harting take leave? They usually do, you know. Defect in comfort, that's my advice.'

'I have no idea.'

'You weren't close to him?'

'Certainly not.'

'What about his friends? What do they say?'

'He has no friends worth speaking of.'

'Any not worth speaking of?'

'So far as I know, he has no close friends in the community. Few of us have. We have acquaintances, but few friends. That is the way of Embassies. With such an intensive social life, one learns to value privacy.'

'How about Germans?'

'I have no idea. He was once on familiar terms with Harry Praschko.'

'Praschko?'

'We have a parliamentary opposition here: the Free Democrats. Praschko is one of its more colourful members. He has been most things in his time: not least a fellow-traveller. There is a note on file to say they were once friendly. They knew one another during the Occupation, I believe. We keep an index of useful contacts. I once questioned him about Praschko as a matter of routine and he told me that the relationship was discontinued. That is all I can tell you.'

'He was once engaged to be married to a girl called Margaret Aickman. This Harry Praschko was named as a character reference. In his capacity as a member of the Bundestag.'

'Well?' 'You've never heard of Aickman?' 'Not a name to me, I'm afraid.' 'Margaret.' 'So you said. I never heard of any engagement, and I never heard

of the woman.' 'Hobbies? Photography? Stamps? Ham radio?'

Turner was writing all the time. He might have been filling in a form.

'He was musical. He played the organ in Chapel. I believe he also had a collection of gramophone records. You would do better to enquire among the Junior Staff; he was more at home with them.'

'You never went to his house?'

'Once. For dinner.'

'Did he come to yours?'

There was the smallest break in the rhythm of their interrogation while Bradfield considered.

'0nce.'

'For dinner?'

'For drinks. He wasn't quite

dinner party material. I am sorry to offend your social instincts.'

'I haven't got any.'

Bradfield did not appear surprised.

'Still, you did go to him, didn't you? I me an you gave him hope.' He rose and ambled back to the window like a great moth lured to the light. 'Got a file on him, have you?' His tone was very detached; he might have been infected by Bradfield's own forensic style.

'Only paysheets, annual reports, a character reference from the Army. It's all very standard stuff. Read it if you want.' When Turner did not reply, he added: 'We keep very little here on staff; they change so often. Harting was the exception.'

'He's been here twenty years.'

'Yes. As I say, he is the exception.'

'And never vetted.' Bradfield said nothing.

'Twenty years in the Embassy, most of them in Chancery. And never vetted once. Name never even submitted. Amazing really.' He might have beep commenting on the view.

'I suppose we all thought it had been done already. He came from the Control Commission after all; one assumes they exacted a certain standard.'

'Quite a privilege being vetted, mind. Not the kind of thing you do for anyone.'

The marquee had gone. Homeless, the two German policemen paced the grey lawn, their wet leather coats flapping lazily round their boots. It's a dream, Turner thought. A noisy unwilling dream. 'Bonn's a very metaphysical place,' de Lisle's agreeable voice reminded him. 'The dreams have quite replaced reality.'

'Shall I tell you something?'

'I can hardly stop you.'

'All right: you've warned me off. That's usual enough. But where's the rest of it?'

'I've no idea what you me an.'

'You've no theory, that's what I me an. It's not like anything I've ever met. There's no panic. No explanation. Why not? He worked for you. You knew him. Now you tell me he's a spy; he's pinched your best files. He's garbage. Is it always like that here when somebody goes? Do the gaps seal that fast?' He waited. 'Let me help you, shall I? "He's been working here for twenty years. We trusted him implicitly. We stilldo." How's that?'

Bradfield said nothing.

'Try again. "I always had my suspicions about him ever since that night we were discussing Karl Marx. Harting swallowed an olive without spitting out thepip." Any good?'

Still Bradfield did not reply.

'You see, it's not usual. See what I me an? He's unimportant. How you wouldn't have him to dinner. How you washed your hands of him. And what a sod he is. What he's betrayed.' Turner watched him with his pale, hunter's eyes; watched for a movement, or a gesture, head cocked waiting for the wind. In vain. 'You don't even bother to explain him, not to me, not to yourself. Nothing. You're just... blank about him. As if you'd sentenced him to death. You don't mind my being personal, do you? Only I'm sure you've not much time: that's the next thing you're going to tell me.'

'I was not aware,' Bradfield said, ice-cold, 'that I was expected to do your job. Nor you mine.'

'Capri. How about that? He's got a bird. The Embassy's in chaos, he pinches some files, flogs them to the Czechs and bolts with her.'

'He has no girl.'

'Aickman. He's dug her up. Gone off with Praschko, two on a bird. Bride, best man and groom.'

'I told you, he has no girl.'

'Oh. So you do know that? I me an there are some things you are sure of. He's a traitor and he's got no bird.'