She pulled the bedside clock round to see it. 'Jesus Christ! The help won't be there for an hour yet.'

'I'm perfectly capable of fixing my own toast and coffee.'

'It's too early for me. I'll call for it when I'm ready.'

He looked at her eyes. She was close to tears. As soon as he left the room she would begin weeping. 'Go back to sleep, Nikki. Do you want an aspirin?'

'No I don't want a goddamned aspirin. Anytime I bug you, you ask me if I want an aspirin: as if talking out of turn was some kind of feminine malady.'

He had often accused her of being a dreamer, which by extension was his claim to be a practical realist. The truth was that he was even more of a romantic dreamer than she was. This craving he had for everything English was ridiculous. He'd even talked of renouncing his US citizenship and was hoping to get one of these knighthoods the British handed out instead of money. An obsession of that kind could bring him only trouble.

There was enough work in the office to keep Bret Rensselaer busy for the first hour or more. It was a wonderful room on the top floor of a modern block. Large by the standards of modern accommodation, his office had been decorated according to his own ideas, as interpreted by one of the best interior decorators in London, He sat behind his big glass-topped desk. The colour scheme – walls, carpet and long leather chesterfield – was entirely grey and black except for his white phone. Bret had intended that the room should be in harmony with this prospect of the slate roofs of central London.

He buzzed for his secretary and started work. Halfway through the morning, his tray emptied by the messenger, he decided to switch off his phone and take twenty minutes to catch up with his physical exercises. It was a part of his puritanical nature and upbringing that he would not make a confrontation with his wife an excuse to miss his work or his exercises.

He was in his shirt-sleeves, doing his thirty pressups, when Dicky Cruyer – a contender for the soon to become vacant chair of the German Stations Controller – put his head round the door and said, 'Bret, your wife has been trying to get through to you.'

Bret continued to do his pressups slowly and methodically. 'And?' he said, trying not to puff.

'She sounded upset,' said Dicky. 'She said something like, "Tell him, you get your man in Moscow and I'll go get my man in Paris." I asked her to tell me again but she rang off.' He watched while Bret finished a couple more pressups.

'I'll talk to her later,' grunted Bret.

'She was at the airport, getting on the plane. She said to say goodbye. "Goodbye for ever," she said.'

'So you've said it,' Bret told him, head twisted, smiling pleasantly from his position full length on the floor. 'Message received and understood.'

Dicky muttered something about it being a bad phone line, nodded and withdrew with the feeling that he'd been unwise to bring the ugly news. He'd heard rumours that all was not going well with the Rensselaer marriage, but no matter how much a man might want to leave his wife it does not mean that he wants her to leave him. Dicky had the feeling that Bret Rensselaer wouldn't forget who it was who had brought news of his wife's desertion, and it would leave a residual antipathy that would taint their relationship for ever after. In this assumption Dicky was correct. He began to hope that the appointment of the German Stations Controller would not be entirely in Bret's gift.

The door clicked shut. Bret began the pressups over again. He had inflicted that mortifying rule on himself: if he stopped during exercises he did them all over again.

When his exercises were done Bret opened the door that concealed a small sink. He washed his face and hands and as he did so he recalled in detail the conversation he'd had with his wife that morning. He told himself not to waste time pondering the rift between them: what was gone was gone, and good riddance. Bret Rensselaer had always claimed that he never wasted time upon recriminations or regrets, but he felt hurt and deeply resentful.

To get his mind on other matters he began to think about those days long ago when he'd wanted to get into Operations. He'd drafted out some ideas about undermining the East German economy but no one had taken him seriously. The Director-General's reaction to the big pile of research he'd done was to give him the European Economics desk. That wasn't really something to complain about; Bret had built the desk into a formidable empire. But the economic desk work had been processing intelligence. He always regretted that they hadn't taken up the more important idea: the idea of promoting change in East Germany.

Bret's idea had never been to get an effective agent into the top of the Moscow KGB. He would prefer having a really brilliant agent, with a long-term disruptive and informative role, in East Berlin, the capital of the German Democratic Republic. It would take a long time: it was not something that could be hurried in the way that so many SIS operations were.

The Department probably had dozens of sleepers who'd established themselves, in one capacity or another, as long-time loyal agents of the various communist regimes of East Europe. Now Bret had to find such a person, and it had to be the right one. But the long, and meticulous process of selection had to be done with such discretion and finesse that no one would be aware of what he was doing. And when he found that man, he'd have the task of persuading him to risk his neck in a way that sleepers were not normally asked to do. A lot of sleepers assigned to deep cover just took the money and relied upon the good chance that they'd never be asked to do anything at all.

It would not be simple. Neither would it be happy. At the beginning there would be little or no cooperation, for the simple reason that no one around him could be told what he was doing. Afterwards there would be the clamour for recognition and rewards. The Department was very concerned about such things. It was natural these men, who laboured so secretly, should strive so vigorously and desperately for the admiration and respect of their peers when things went well. And if things did not go well there would be the savage recriminations that accompanied post-mortems.

Lastly there was the effect that an operation like this would have upon the man who went off to do the dirty work. They did not come back. Or if they did come back they were never fit to work again. Of the survivors Bret had seen, few returned able to do anything but sit with a rug over their knees, talk to the officially approved departmental shrink, and try vainly to put together ruptured nerves and shattered relationships.

It was easy to see why they couldn't recover. You ask a man to leave all that he holds most dear, to spy in a strange country. Then, years later, you snatch him back again – God willing – to live out his remaining life in peace and contentment. But there is no peace and no contentment either. The poor devil can't remember anyone he hasn't betrayed or abandoned at some time or another. Such people are destroyed as surely as if they'd faced a firing squad.

On the other hand it was necessary to balance the destruction of one man – plus perhaps a few members of his family – with what could be achieved by such a coup. It was a matter of the greater good of the community at large. They were fighting against a system which killed hundreds of thousands in labour camps, which used torture as a normal part of its police interrogation, which put dissenters into mental asylums. It would be absurd to be squeamish when the stakes were so high.

Bret Rensselaer closed the door that hid his sink and went to the window and looked out. Despite the haze, you could see it all from here: the Gothic spike of the Palace of Westminster, the spire of St Martin's in the Fields, Nelson balancing gingerly on his column. There was a unity to it. Even the incongruous Post Office tower would perhaps look all right given a century or so of weathering. Bret pushed his face close to the glass in order to see Wren's dome of St Paul's. The Director-General's room had a fine view northwards and Bret envied him that. One day perhaps he would occupy that room. Nikki had made jokes about that and he'd pretended to laugh at them but he'd not given up hopes that one day…