'How do you mean?'

I said. His nervous tensions escaped in small jerks of his head as he brought forth some unflattering opinions. 'Well, one hesitates to say so, of course, to top trainers like Caspar, but it is all too easy to strain a two-year-old's heart, and if they are good two-year-olds they run in top races, and the pressure to win may be terrific, because of stud values and everything, and a jockey, riding strictly to orders, mind you, may press a game youngster so hard that although it wins it is also more or less ruined for the future.'

'Gleaner won the Doncaster Futurity in the mud,' I said thoughtfully.

'I saw it. It was a very hard race.'

'That's right,' Brothersmith said. 'I checked him thoroughly afterwards, though. The trouble didn't start at once. In fact, it didn't show at all, until he ran in the Guineas. He came in from that in a state of complete exhaustion. First of all we thought it was the virus but then after a few days we got this very irregular heart beat, and then it was obvious what was the matter.'

'What virus?' I said.

'Let's see… The evening of the Guineas he had a very slight fever, as if he were in for equine 'flu, or some such. But it didn't develop. So it wasn't that. It was his heart, all right. But we couldn't have foreseen it.'

'What percentage of horses develop bad hearts?' I said.

Some of the chronic anxiety state diminished as he moved confidently onto neutral ground.

'Perhaps ten per cent have irregular heart beats. It doesn't alway mean anything. Owners don't like to buy horses which have them, but look at Night Nurse which won the Champion Hurdle, that had a heart murmur.'

'But how often do you get horses having to stop racing because of bad hearts?' He shrugged. 'Perhaps two or three in a hundred.'

George Caspar, I reflected, trained upwards of a hundred and thirty horses, year after year. 'On average,' I said, 'are George Caspar's horses more prone to bad hearts than any other trainer's?'

The anxiety state returned in full force. 'I don't know if I should answer that.'

'If it's "no",' I said, 'what's the hassle?' 'But your purpose in asking…'

'A client,' I said, lying with regrettable ease, 'wants to know if he should send George Caspar a sparkling yearling. He asked me to check on Gleaner and Zingaloo.'

'Oh, I see. Well, no, I don't suppose he has more. Nothing significant. Caspar's an excellent trainer, of course. If your client isn't too greedy when his horse is two, there shouldn't be any risk at all.'

'Thanks, then.' I stood up and shook hands with him. 'I suppose there's no heart trouble with Tri-Nitro?'

'None at all. Sound, through and through. His heart bangs away like a gong, loud and clear.'

'That's that, then,' Chico said over a pint and pie in the White Hart Hotel. 'End of case. Mrs Caspar's off her tiny rocker, and no one's been getting at George Caspar's youngsters except George Caspar himself.'

'She won't be pleased to hear it,' I said.

'Will you tell her?'

'Straight away. If she's convinced, she might calm down.'

So I telephoned to George Caspar's house, and asked for Rosemary, saying I was a Mr Barnes. She came on the line and said hallo in the questioning voice one uses to unknown callers.

'Mr… Barnes?'

'It's Sid Halley.'

The alarm came instantly.

'I can't talk to you.'

'Can you meet me, then?'

'Of course not. I've no reason for going to London.'

'I'm just down the road, in the town,' I said. 'I've things to tell you. And I don't honestly think there's any need for disguises and so on.'

'Im not being seen with you in Newmarket.'

She agreed, however, to drive out in her car, pick Chico up, and go where he directed: and Chico and I worked out a place on the map which looked a tranquillising spot for paranoiacs. The churchyard at Barton Mills, eight miles towards Norwich.

We parked the cars side by side at the gate and Rosemary walked with me among the graves. She was wearing again the fawn raincoat and a scarf, but not this time the false curls. The wind blew wisps of her own chestnut hair across her eyes, and she pulled them away impatiently: not with quite as much tension as when she had come to my flat, but still with more force than was needed.

I told her I had been to see Tom Garvey and Henry Thrace at their stud farms. I told her I had talked to Brothersmith; and I told her what they'd all said. She listened, and shook her head.

'The horses were nobbled,' she said obstinately. 'I'm sure they were.'

'How?'

'I don't know how.' Her voice rose sharply, the agitation showing in spasms of the muscles round her mouth. 'But I told you. I told you, they'll get at Tri-Nitro. A week today, it's the Guineas. You've got to keep him safe for a week.'

We walked along the path beside the quiet mounds and the grey weatherbeaten headstones. The grass was mown, but there were no flowers, and no mourners. The dead there were long gone, long forgotten. Raw grief and tears now in the municipal plot outside the town; brown heaps of earth and brilliant wreaths and desolation in tidy rows.

'George has doubled the security on Tri-Nitro,' I said.

'I know that. Don't be stupid.'

I said reluctantly, 'In the normal course of events he'll be giving Tri-Nitro some strong work before the Guineas. Probably on Saturday morning.'

'I suppose so. What do you mean? Why do you ask?'

'Well…' I paused, wondering if indeed it would be sensible to suggest a way-out theory without testing it, and thinking that there was no way of testing it anyway.

'Go on,' she said sharply. 'What do you mean?'

'You could… er… make sure he takes all sorts of precautions when he gives Tri-Nitro that last gallop.' I paused. 'Inspect the saddle… that sort of thing.'

Rosemary said fiercely, 'What are you saying? Spell it out, for God's sake. Don't pussyfoot round it.'

'Lots of races have been lost because of too-hard training gallops too soon beforehand.' 'Of course,' she said impatiently. 'Everyone knows that. But George would never do it.'

'What if the saddle was packed with lead? What if a three-year-old was given a strong gallop carrying fifty pounds dead weight? And then ran under severe pressure a few days later in the Guineas? And strained his heart?'

'My God,' she said. 'My God.'

'I'm not saying that it did happen to Zingaloo and Gleaner, or anything like it. Only that it's a distant possibility. And if it's something like that… it must involve someone inside the stable.'

She had begun trembling again.

'You must go on,' she said. 'Please go on trying. I brought some money for you.' She plunged a hand into her raincoat pocket and brought out a smallish brown envelope. 'It's cash. I can't give you a cheque.'

'I haven't earned it,' I said.

'Yes, yes. Take it.' She was insistent, and finally I put it in my pocket, unopened.

'Let me consult George,' I said.

'No. He'd be furious. I'll do it… I mean, I'll warn him about the gallops. He thinks I'm crazy, but if I go on about it long enough he'll take notice.' She looked at her watch and her agitation increased. 'I'll have to go back now. I said I was going for a walk on the Heath. I never do that. I'll have to get back, or they'll be wondering.'

'Who'll be wondering?'

'George, of course.'

'Does he know where you are every minute of the day?'

We were retracing our steps with some speed towards the churchyard gates. Rosemary looked as if she would soon be running.

'We always talk. He asks where I've been. He's not suspicious… it's just a habit. We're always together. Well, you know what it's like in a racing household. Owners come at odd times. George likes me to be there.'