He thought for a few moments. 'You'd better decide for yourself. If he gets on the motorway to Scotland… well, don't go.'

'All right.'

'Very interesting,' Millington said, 'that he didn't want to be seen in public accepting that briefcase.'

'Very.'

'Anything special about it?'

'As far as I could see,' I said, 'it was black, polished, possibly crocodile, with gold clasps.'

'Well, well,' Millington said vaguely. 'I'll get back to you with that car number.'

The thin man's car aimed unerringly for the motorway in the direction of Scotland. I decided to keep on going at least until Millington called back, which he did with impressive speed, telling me that my quarry was registered to I. J. Horfitz, resident of Doncaster, address supplied.

'All right,' I said, 'I'll go to Doncaster.' An hour and a bit ahead, I thought, with plenty of time to return.

'Does that name Horfitz ring any bells with you?' Millington asked.

'None at all,' I said positively. 'And by the way, you know that promising young apprentice of Pete Shaw's? All that talent? The silly young fool passed some verbal info to a new character on the racecourse who turned out to be writing the book for Collie Goodboy. Collie Goodboy thought it good news.'

'What was it, do you know?'

'Pete Shaw had a runner in the second race, third favourite, finished nearly last. The apprentice knew the score, though he wasn't riding it.'

'Huh,' Millington said. 'I'll put the fear of God into the lot of them, Pete Shaw, the owner, the jockey, the apprentice and Collie Goodboy. Stir them up and warn them. I suppose,' he said as an afterthought, 'you didn't get any photos? We haven't any actual proof?'

'Not really. I took one shot of the apprentice talking to Collie's man, but they had their backs to me. One of Collie's man with. One of Collie s board with the generous odds.'

'Better than nothing,' he said judiciously 'It'll give them all an unholy fright. The innocent ones will be livid and sack the guilty, like they usually do. Clean their own house. Save us a job. And we'll keep a permanent eye on that stupid apprentice. Ring me when you get to Doncaster '

'OK. And I took some more photos One of the nervous young man with the briefcase, one of him with the thin man… er… I. J. Horfitz possibly, I suppose, and one of Filmer with the briefcase, though I'm not sure if that one will be very clear, I had almost no time and I was quite far away, and I was using the cigarette lighter camera, it's less conspicuous.'

'All right. We need that film before you go. Um… er… you'd better give me a ring when you're on the way back, and I'll have thought of somewhere we can meet tonight. Right?'

'Yes, 'I said. 'Right.'

'This Horfitz person, what did he look like?'

'Thin, elderly, wore a dark overcoat and a black trilby, and glasses. Looked ready for a funeral, not the races.'

Millington grunted in what seemed to me to be recognition.

'Do you know him?' I asked.

'He was before your time. But yes, I know him. Ivor Horfitz. It must be him. We got him warned off for life five years ago.'

'What for?'

'It's a long story. I'll tell you later. And I don't think after all you need to spend all that time going to Doncaster. We can always find him, if we want to. Turn round at the next exit and come back to London, and I'll meet you in that pub at Victoria. Not the snack-bar; the pub.'

'Yes, right. See you in about… um… two and a half hours, with luck.'

Two and a half hours later, beer and pork pie time in a dark far corner in a noisy bar, Millington 's preferred sort of habitat.

I gave him the exposed but undeveloped film, which he put in his pocket saying, 'Eyes in the back of my head,' with conspicuous satisfaction.

'Who is Horfitz?' I said, quenching the long drive's thirst in a half-pint of draught. 'Did you know he knew Filmer?'

'No,' he said, answering the second question first. 'And Filmer wouldn't want to be seen with him, nor to be seen in any sort of contact.'

'What you're saying,' I said slowly, 'is that the messenger, the nervous young man, is also known by sight to the stewards… to you yourself probably… because if he were an unidentifiable stranger, why should Filmer react so violently to being seen with him; to being seen accepting something from him?'

Millington gave me a sideways look. 'You've learned a thing or two, haven't you, since you started.' He patted the pocket containing the film. 'This will tell us if we know him. What did he look like?’

'Fairly plump, fairly gormless. Sweaty. Unhappy. A worm between two hawks.'

Millington shook his head. 'Might be anyone,' he said.

'What did Horfitz do?' I asked.

Millington bit into pork pie and took his time, speaking eventually round escaping crumbs of pastry.

'He owned a small stableful of horses in Newmarket and employed his own trainer for them, who naturally did what he was told. Very successful little stable in a quiet way. Amazing results, but there you are, some owners are always lucky. Then the trainer got cold feet because he thought we were on to him, which we actually weren't, we'd never reckoned him for a villain. Anyway, he blew the whistle on the operation, saying the strain was getting too much for him. He said all the horses in the yard were as good as interchangeable. They ran in whatever races he and Horfitz thought they could win. Three-year-olds in two-year-old races, past winners in maidens-at-starting, any old thing. Horfitz bought and sold horses continually so the yard never looked the same from week to week, and the stable lads came and went like yo-yos, like they do pretty much anyway. They employed all sorts of different jockeys. No one cottoned on. Horfitz had some nice long-priced winners but no bookmakers hollered foul. It was a small unfashionable stable, see? Never in the newspapers. Because they didn't run in big races, just small ones at tracks the press don't go to, but you can win as much by betting on those as on any others. It was all pretty low key, but we found out that Horfitz had made literally hundreds of thousands, not just by betting but by selling his winners. Only he always sold the real horses which fitted the names on the race-card, not the horses that had actually run. He kept those and ran them again, and sold the horses in whose names they'd run, and so on and so on. Audacious little fiddle, the whole thing.'

'Yes,' I agreed, and felt a certain amount of awe at the energy and organization put into the enterprise.

'So when the trainer ratted we set a few traps with his help and caught Horfitz with his pants down, so to speak. He got warned off for life and swore to kill his trainer, which he hasn't done so far. The trainer was warned off for three years with a severe caution, but he got his licence back two years ago. Part of the bargain. So he's in business again in a small way but we keep his runners under a microscope, checking their passports every time they run. We're a lot hotter at checking passports randomly all over the place now, as of course you know.'

I nodded.

Then Millington 's jaw literally dropped. I looked at the classic sign of astonishment and said, 'What's the matter?'

'Gawd,' he said. 'What a turn up. Can you believe it? Paul Shacklebury, that murdered stable lad, he was working for Horfitz's old trainer.'

I left Millington frowning with concentration over a replenished pint while he tried to work out the significance of Horfitz's old trainer employing a lad who was murdered for knowing too much about Filmer. What had Paul Shacklebury known, Millington demanded rhetorically for the hundredth time. And, more to the minute, what was in the briefcase, and why was Horfitz giving it to Filmer?

'Work on the sweating messenger,' I suggested, getting up to go. 'He might crack open like the trainer. You never know.'