The house was obviously Georgian, not perhaps the best Georgian, but solidly built, agreeably proportioned and with the look of all good domestic architecture of having grown naturally out of its site. The mellow brick, festooned with wisteria, gleamed richly in the evening sun so that the green of the creeper glowed and the whole house looked suddenly as artificial and unsubstantial as a film set. It was essentially a family house, a welcoming house. But now a heavy silence lay over it and the rows of elegantly proportioned windows were empty eyes.

Lunn, who had driven fast but skilfully, braked in front of the porch. He stayed in his seat while the two women got out then drove the van round the side of the house. As she slid down from the high seat Cordelia could glimpse a range of low buildings, topped with small ornamental turrets, which she took to be stables or garages. Through the wide-arched gateway she could see that the grounds dropped slowly away to give a far vista of the flat Cambridgeshire countryside, patterned with the gentle greens and fawns of early summer. Miss Learning said:

'The stable-block has been converted into laboratories. Most of the east side is now glass. It was a skilful job by a Swedish architect, functional but attractive.'

For the first time since they had met her voice sounded interested, almost enthusiastic.

The front door was open. Cordelia came into a wide, panelled hall with a staircase curving to the left, a carved stone fireplace to the right. She was aware of a smell of roses and lavender, of carpets gleaming richly against polished wood, of the subdued ticking of a clock.

Miss Learning led the way to a door immediately across the hall. It led to a study, a room book-lined and elegant, one with a view of wide lawns and a shield of trees. In front of the french windows was a Georgian desk and behind the desk sat a man.

Cordelia had seen his photographs in the press and knew what to expect. But he was at once smaller and more impressive than she had imagined. She knew that she was facing a man of authority and high intelligence; his strength came over like a physical force. But as he rose from his seat and waved her to a chair, she saw that he was slighter than his photographs suggested, the heavy shoulders and impressive head making the body look top-heavy. He had a lined, sensitive face with a high-bridged nose, deep-set eyes on which the lids weighed heavily and a mobile, sculptured mouth. His black hair, as yet unflecked with grey, lay heavily across his brow. His face was shadowed with weariness and, as Cordelia came closer, she could detect the twitch of a nerve in his left temple and the almost imperceptible staining of the veins in the irises of the deep-set eyes. But his compact body, taut with energy and latent vigour, made no concession to tiredness. The arrogant head was held high, the eyes were keen and wary under the heavy lids. Above all he looked successful. Cordelia had seen that look before, had recognized it from the back of crowds as, inscrutable, they had watched the famous and notorious pass on their way – that almost physical glow, akin to sexuality and undimmed by weariness or ill-health, of men who knew and enjoyed the realities of power.

Miss Learning said:

This is all that remains of Pryde's Detective Agency – Miss Cordelia Gray.' The keen eyes looked into Cordelia's. 'We take a Pride in our Work. Do you?'

Cordelia, tired after her journey at the end of a momentous day, was in no mood for jokes about poor Bernie's pathetic pun. She said:

'Sir Ronald, I have come here because your secretary said that you might want to employ me. If she's wrong, I would be glad to know so that I can get back to London.'

'She isn't my secretary and she isn't wrong. You must forgive my discourtesy; it's a little disconcerting to expect a burly ex-policeman and to get you. I'm not complaining, Miss Gray; you might do very well. What are your fees?'

The question might have sounded offensive but it wasn't; he was completely matter-of-fact. Cordelia told him, a little too quickly, a little too eagerly.

'Five pounds a day and expenses, but we try to keep those as low as possible. For that, of course, you get my sole services. I mean I don't work for any other client until your case is finished.'

'And is there another client?'

'Well, not just at present but there very well could be.' She went on quickly:

'We have a fair-play clause. If I decide at any stage of the investigation that I'd rather not go on with it, you are entitled to any information I have gained up to that point. If I decide to withhold it from you, then I make no charge for the work already done.'

That had been one of Bernie's principles. He had been a great man for principles. Even when there hadn't been a case for a week, he could happily discuss the extent to which they would be justified in telling a client less than the full truth, the point at which the police Ought to be brought into an inquiry, the ethics of deception or lying in the service of truth. 'But no bugging,' Bernie would say, 'I set my face firmly against bugging. And we don't touch industrial sabotage.'

The temptation to either wasn't great. They had no bugging equipment and wouldn't have known how to use it if they had, and at no time had Bernie been invited to touch industrial sabotage.

Sir Ronald said:

'That sounds reasonable but I don't think this case will present you with any crisis of conscience. It is comparatively simple. Eighteen days ago my son hanged himself. I want you to find out why. Can you do that?'

'I should like to try, Sir Ronald.'

'I realize that you need certain basic information about Mark. Miss Learning will type it out for you, then you can read it through and let us know what else you require.'

Cordelia said:

'I should like you to tell me yourself, please.'

'Is that necessary?'

'It would be helpful to me.'

He settled again into his chair and picked up a stub of pencil, twisting it in his hands. After a minute he slipped it absent-mindedly into his pocket. Without looking at her, he began to speak.

'My son Mark was twenty-one on the 25th April this year. He was at Cambridge reading history at my old college and was in his final year. Five weeks ago and without warning, he left the university and took a job as gardener with a Major Markland, who lives in a house called Summertrees outside Duxford. Mark gave me no explanation of this action either then or later. He lived alone in a cottage in Major Markland's grounds. Eighteen days later he was found by his employer's sister hanging by the neck from a strap knotted to a hook in the sitting-room ceiling. The verdict at the inquest was that he took his life while the balance of his mind was disturbed. I know little of my son's mind but I reject that comfortable euphemism. He was a rational person. He had a reason for his action. I want to know what it was.'

Miss Learning, who had been looking out of the french windows to the garden, turned and said with sudden vehemence:

'This lust always to know! It's only prying. If he'd wanted us to know, he'd have told us.'

Sir Ronald said:

'I'm not prepared to go on in this uncertainty. My son is dead. My son. If I am in some way responsible, I prefer to know. If anyone else is responsible I want to know that too.'

Cordelia looked from one to the other. She asked:

'Did he leave anote?'

'He left a note but not an explanation. It was found in his typewriter.'

Quietly Miss Learning began to speak:

'Down the winding cavern we groped our tedious way, till a void boundless as the nether sky appeared beneath us, and we held by the roots of trees and hung over this immensity; but I said: if you please we will commit ourselves to this void and see whether providence is here also.'