'So?'

'So I'd like to do something about it.'

'You mean – organize an expedition?'

'That's right.' Saying it aloud began to jell all the ideas that had been bubbling up in me since the assay.

Geordie knocked the dottle out of his pipe. Tell me, Mike, what's your interest in this – scientific or personal? You weren't particularly friendly towards Mark. Is it that you feel that Trevelyans should be free to go about their business without being murdered, or is it something else?'

'It's that and a lot more. For one thing, someone is pushing me around and I don't like it. I don't like having my home burgled, being knifed, or having my friends shot at. And I don't appreciate having my brother murdered, if that's really what happened, no matter what I thought of him as a person. Then, of course, there's the scientific interest – I'm fascinated. A find like this would hit oceanography like evolution hit biology. And then there's the money.'

'Yes,' said Geordie. 'I suppose there would be money in it.'

'You suppose damn right. And if you're thinking in millions, stop it, because you're thinking small – it could be billions.'

He wasn't ready to be enthusiastic. 'So you think it's as good as that?'

'As good as that,' I said firmly. 'There's enough at stake for quite a few murders.'

'How much would such an expedition cost?'

I had already been thinking about that. 'A ship- plus about fifty thousand for special equipment – plus stores and running expenses.'

'Running expenses for how long?'

I smiled wryly. 'That's one of the jokers – who knows in a thing like this?'

'It's a lot of money. And there's over sixty million square miles of Pacific, you said.'

'I know my job,' I said. 'I wouldn't be going entirely blindfold. I know a hell of a lot of places where there aren't any high-cobalt nodules. And there's what I can recall of Mark's theories – perhaps they're not so fantastic after all. Plus there's this – I'm sure we can make something of it.' I held up Mark's little diary, which I was keeping on my person.

Geordie slapped his hands together suddenly. 'All right, boy. If you can find the capital and the running expenses – and God knows where you'll find money like that – I can provide the ship. Would old Esmerelda do?'

'My God, she'd be perfect for running on a small budget.' I looked at him closely, trying not to show my excitement too much. 'But why should you come into this? It's a chancy business, you know.'

He laughed. 'Well, you did mention a few billions of money. Besides, some little bastard shot off the top of my little finger. I'm not particularly interested in him, but I would like to get my hands round the neck of the man who paid him. And chartering tourists isn't very much fun after a bit. I suppose you have some ideas about finance? I mean, without a tame banker it's a non-starter.'

I had been thinking about it, for the last hour or two in between our bouts of conversation. The pieces seemed to be dropping into place nicely, so far.

I said musingly, 'I saw Clare Campbell the other day – she's in town with her father, attending some conference or other. He's my goal.'

'Who is Campbell?'

'Jonathan Campbell – never known as J.C. A Scottish Canadian mining man. Mark worked for him for a while after the IGY – something to do with a mining venture in South America…' I trailed off and Geordie cocked his head enquiringly. Something about that statement teased at me but I couldn't identify it and let it go with a shake of my head.

'So he's got money.'

'He's loaded with it,' I said, back on the track. 'He's got the reputation of being a bit of a plunger, and this thing might appeal to him. He lost a packet in the South American business not long ago – something to do with mines being nationalized – but I think he's got enough left to take a gamble on something new.'

'How do you know all this about Campbell, Mike? I didn't know you studied the financial pages.'

'I was thinking of getting out of pure research after the IGY. The pay's small compared with industry, so I thought I'd look about for a job compatible with my expensive tastes.' I waved a hand around my modest flat. 'Lots of other chaps did it – Mark was one – so I did a bit of investigating and Campbell cropped up.'

'But you didn't take the job.'

I shook my head. 'He'd already signed Mark on, you see, and I didn't fancy having Mark as a colleague. Anyway, I was asked to go to the Institute about that time – less pay, but a more interesting job. Mark left the IGY programme early and got out of pure research. I never actually met Campbell but I did once meet his daughter – in Vancouver. Mark had her in tow. They seemed to be pretty close – they would, she being the boss's daughter.'

Geordie's voice had become as cold as mine. 'Poor stupid cow.'

I thought that she didn't look like his description at all, and wondered how long it had taken for her to read Mark's character. She hadn't struck me then as the sort of girl to be taken in for long. But I hoped that nothing much had happened between them, lest it colour Campbell's attitude towards me when I came to approach him.

'How long did Mark work for Campbell?'

'Not very long- about a year and a half. Then he pushed off into the South Pacific and teamed up with Norgaard, last I heard of it. I don't know exactly what they were doing – they had neither a decent boat nor the right equipment for proper research, as far as I could tell.'

'But if Campbell's a mining man, what makes you think he'll finance a deep sea adventure?'

'I think he might,' I said. 'Metals are his business. Never gold or silver, nor the other end of the scale, the base metals. He's dabbled in tin and copper and had a go at platinum once. Now it seems he's concentrating on alloy metals – titanium, cobalt, vanadium and stuff like that. Now that rocketry is big business there's a boom in these metals.'

Geordie asked curiously, 'How does he go about it – his investing, I mean?'

'He takes advantage of us scientific types. He employs a few good men – people like Mark, for instance – and the number varies from time to time. Most of them are geologists, of course. He organizes field expeditions into remote parts, spots a body of ore, puts a million or so into proving and development, then pulls out and sells to the real big boys at a profit. I heard that in one of his recent ventures he put in two million dollars and a year of his time, then sold out at a net profit of a million and a quarter. Not bad for a year's work, eh, Geordie?'

'Not bad at all. But I'd say it needs experience and a hell of a lot of cold nerve.'

'Oh, he's a canny Scot, all right. I hope he's still in town -I'll find out tomorrow.'

'What about Kane – why not put the coppers on to him?'

I shook my head vigorously. 'Not now. All they'd do would be to pass on a query to Tahiti and I've no positive faith in the activities of the French Colonial Police, especially when there's a convenient legal death certificate handy. The delays would be awful, for one thing. No, I'll see for myself – if I can get Campbell interested. I would dearly like to talk to Dr Schouten.'

Geordie rubbed his chin meditatively. 'I'm thinking of making one or two changes in the crew if we go on this caper. I'd like a couple of blokes I know from the old days. I wonder what Ian Lewis is doing now? When I met him a few months ago he said he found life a little tedious.'

I vaguely remembered a tall, gangling Highlander. 'What was he doing?'

'Oh, he had a place in the Scottish wilderness that he said he'd be glad to leave. You know, I reckon I could get you half a dozen good chaps, all trained fighters and some of them seamen. I've got a couple anyway that I'd keep on for this trip.'

I had a dawning suspicion of what was in Geordie's mind. 'Hold on – what's the idea?'