The pathetic stable lad turned up in a ditch two days later with his neck broken, and the police (Millington assisting) put together a watertight-looking conspiracy case, establishing Julius Filmer as paymaster and planner of the crime. Then, on the day of his trial, odd things happened to the four prosecution witnesses. One had a nervous breakdown and was admitted in hysteria to a mental hospital, one disappeared altogether and was later seen in Spain, and two became mysteriously unclear about facts that had been razor-sharp in their memories earlier. The defence brought to the witness box a nice young man who swore on oath that Mr Filmer had been nowhere near the Newmarket hotel where the conspiracy was alleged to have been hatched but had instead been discussing business with him all night in a motel (bill produced) three hundred miles away. The jury was not allowed to know that the beautifully-mannered, well-dressed, blow-dried, quietly-spoken youth was already serving time for confidence tricks and had arrived at court in a Black Maria.

Almost everyone else in the court lawyers, police, the judge himself knew that the nice young man had been out on bail on the night in question, and that even though the actual murderer was still unknown, Filmer had beyond doubt arranged the stable lad's killing.

Julius Apollo Filmer smirked with satisfaction at the 'Not Guilty’ verdict and clasped his lawyer in a bear-hug. Justice had been mocked. The stable lad's parents wept bitter tears over his grave and the Jockey Club ground its collective teeth. Millington swore to get Filmer somehow, anyhow, in the future, and had made it into a personal vendetta, the pursuit of this one villain filling his mind to the exclusion of nearly everything else.

He had spent a great deal of time in the Newmarket pubs going over the ground the regular police had already covered, trying to find out exactly what Paul Shacklebury, the dead stable lad, had known to the detriment of Filmer. No one knew or no one was saying. And who could blame anyone for not risking a quick trip to the ditch.

Millington had had more luck with the hysterical witness, now back home but still suffering fits of the shivers. She, the witness, was a chambermaid in the hotel where Filmer had plotted. She had heard, and had originally been prepared to swear she had heard Filmer say to an unidentified man, 'If he's dead, he's worth five grand to you and five to the hatchet, so go and fix it.'

She had been hanging fresh towels in the bathroom when the two men came in from the corridor, talking. Filmer had been abrupt with her and bundled her out and she hadn't looked at the other man. She remembered the words clearly but hadn't of course seen their significance until later. It was because of the word 'hatchet' that she remembered particularly.

A month after the trial Millington got from her a half-admission that she'd been threatened not to give evidence. Who had threatened her' A man she didn't know. But she would deny it. She would deny everything, she would have another collapse. The man had threatened to harm her sixteen-year-old daughter. Harm he'd spelled out all the dreadful programme lying ahead.

Millington, who could lay on the syrup if it pleased him, had persuaded her with many a honeyed promise (that he wouldn't necessarily keep) to come for several days to the races, and there, from the safety of various strategically placed security offices, he'd invited her to look out of the window. She would be in shadow, seated, comfortable, invisible, and he would point out a few people to her. She was nervous and came in a wig and dark glasses. Millington got her to remove the glasses. She sat in an upright armchair and twisted her head to look over her shoulder at me, where I stood quietly behind her.

'Never mind about him,' Millington said. 'He's part of the scenery.'

All the world went past those windows on racing afternoons, which was why, of course, the windows were where they were. Over three long sessions during a single week on three different racecourses Millington pointed out to her almost every known associate and friend of Filmer's, but she shook her head to them all. At the fourth attempt, the following week, Filmer himself strolled past, and I thought we'd have a repeat of the hysterics: but though our chambermaid wobbled and wept and begged for repeated assurances he would never know she had seen him, she stayed at her post. And she astonished us, shortly after, by pointing towards a group of passing people we'd never before linked with Filmer.

'That's him,' she said, gasping 'Oh my God… that's him… I'd know him anywhere.'

'Which one?' Millington said urgently.

'In the navy… with the grey sort of hair. Oh my God… don't let him know…' Her voice rose with panic.

I could hear the beginnings of Millington 's reassurances as I fairly sprinted out of the office and through to the open air, slowing there at once to the much slower speed of the crowd making its way from paddock to stands for the next race. The navy suit with the silvery hair above it was in no hurry, going along with the press. I followed him discreetly for the rest of the afternoon, and only once did he touch base with Filmer, and then as if accidentally, as between strangers.

The exchange looked as if navy-suit asked Filmer the time. Filmer looked at his watch and spoke. Navy-suit nodded and walked on. Navy-suit was Filmer's man, all right, but was never to be seen to be that in public: just like me and Millington.

I followed navy-suit from the racecourse in the going-home traffic and telephoned from my car to Millington.

'He's driving a Jaguar,' I said, 'licence number A 576 FDD. He spoke to Filmer. He's our man.'

'Right.'

'How's the lady?' I asked.

'Who? Oh, her. I had to send Harrison all the way back to Newmarket with her. She was half off her rocker again. Have you still got our man in sight?'

'Yep. ',

'I'll get back to you.'

Harrison was one of Millington 's regular troops, an ex-policeman, heavy, avuncular, near to pensioned retirement. I'd never spoken to him, but I knew him well by sight, as I knew all the others. It had taken me quite a while to get used to belonging to a body of men who didn't know I was there; rather as if I were a ghost.

I was never noticeable. I was twenty-nine, six foot tall, brown haired, brown eyed, twelve stone in weight with, as they say, no distinguishing features. I was always part of the moving race crowd, looking at my race-card, wandering about, looking at horses, watching races, having a bet or two. It was easy because there were always a great many other people around doing exactly the same thing. I was a grazing sheep in a flock. I changed my clothes and general appearance from day to day and never made acquaintances, and it was lonely quite often, but also fascinating.

I knew by sight all the jockeys and trainers and very many owners, because all one needed for that was eyes and race-cards, but also I knew a lot of their histories from long memory, as I'd spent much of my childhood and teens on racecourses, towed along by the elderly race-mad aunt who had brought me up. Through her knowledge and via her witty tongue I had become a veritable walking data bank; and then, at eighteen, after her death, I'd gone world-wandering for seven years. When I returned, I no longer looked like the unmatured youth I'd been, and the eyes of the people who had known me vaguely as a child slid over me without recognition.

I returned to England finally because at twenty-five I'd come into inheritances from both my aunt and my father, and my trustees were wanting instructions. I had been in touch with them from time to time, and they had despatched funds to far-flung outposts fairly often, but when I walked into the hushed book-lined law office of the senior partner of Cornborough, Cross and George, old Clement Cornborough greeted me with a frown and stayed sitting down behind his desk.