By the end of our talk I was even more depressed than he was. There wasn't a thing I could do for him or his patients, and I was profoundly frustrated by my helplessness. Never before in my adult life had I been unable to cope with a situation, and it galled me.

Burns, passing by, said casually, 'Hey, Mannix, the coon captain wants you,' and walked on.

'Burns!'

He looked back over his shoulder. 'Yes?'

'Come here.'

He swung back. 'You got a beef?'

I said, This morning Captain Sadiq persuaded his superior officer to let him stay with this convoy. He put his career on the line for us. What's more, over the past few days he's worked harder than you could in a month, and a damned sight more willingly. Around here you'll speak respectfully of and to him. Got the idea?'

Touchy, aren't you?' he said.

'Yes I am. Don't push me, Burns.'

'What the hell do you want from me?' he asked.

I sighed, letting my neck muscles relax. 'You will not refer to the Captain as a coon or a nigger. Nor his soldiers, nor any other Nyalans, come to that. We're fed up with it.'

'Why should I take orders from you?' he asked.

I said, 'Because right now I'm top man around here. As long as you're with us you do what I say, and if you don't toe the line you'll be out on your can. And you won't hold a job with Lat-Am or any other oil company after this is over. If you don't think I can swing that then you just ask Mister Kemp.'

I turned my back and walked away, seething. If I'd been near him much longer I couldn't have kept my hands off him, which wouldn't have solved any problems. I passed a couple of staring men and then McGrath was beside me, speaking softly.

'Need any help, Mannix?'

'No,' I said curtly. McGrath stuck in my craw too.

'I'll be around if you do.' He returned to his job.

I recalled that the reason for this outburst had been that Captain Sadiq wanted a word, and I set about finding him. It was a routine matter he wanted settled. After our business was over I pointed to the milling flock of Nyalans around the camp.

'Captain, how many of them are there?' I asked.

'Perhaps two hundred, Mister Mannix. But they do not stay with us for long. It is only that there are always more of them.'

'Yes, I've noticed that. I understand they've attached themselves to the rig, made some sort of mascot of it. Do you know anything about it?'

'I am of Islam,' he said. 'These people have different ideas from you and me. But they are not savages, Mister Mannix. Perhaps it is no more than the thing Mister Lang hangs in the cab of his tractor. It is a lucky charm.'

'That's a rabbit's foot. I see what you mean,' I said, impressed by his logic. 'Just a bigger talisman than usual. But I'm worried about them. Are they getting enough food and water? What if a real sickness strikes among them? What can we do to stop them, make them return to their homes?'

'I do not think anything will stop them, sir. They manage for food, and none will walk further than he can achieve. For each of them, that is enough.'

One thing it ensured was a redistribution of the local population, a reshuffle of families, genes and customs; perhaps not altogether a bad thing. But it was a hell of a way to go about it. And suppose ill fortune should fall on these people while they were tailing us. Would they see their erstwhile lucky talisman becoming a force of evil instead, and if so what might they take it into their collective heads to do about it, and about us?

I reflected on the crusades. Not all of them were made by armed and mailed men; there was the Peasants' Crusade led by Peter the Hermit, and the Children's Crusade. If I remembered my history, terrible things happened to those kids. And come to think of it, Hamelin's rats and children didn't do too well either.

I didn't much relish the role of a twentieth century Peter leading a mad crusade into nowhere. A whole lot of people could die that way. The thought of an armoured column ploughing through this mob chilled my blood.

The run-in with Burns later that day was inevitable, a curtain-raiser to the real drama that followed. The men who work the oil rigs are a tough bunch and you don't get to boss a drilling crew by backing down from a fight. Maybe I should have handled Burns more tactfully, maybe I was losing my touch, but there it was. I had threatened him and I might have known he wouldn't stand still for it.

But that was yet to come. First we had to set up the cotton warehouse for Dr Kat to move in to the next day, and we parked the rig close by in order to run a cable from its generator. Ben Hammond, as usual, provided ideas and the equipment to put them into action, and his goody box included a sizeable reel of cable and several powerful lamps.

While this was being done I had a look around the warehouse. It was just a huge barn about a quarter full of cotton stacked at the far end. The bottom stacks were compressed but the upper layers were soft and would provide comfort for everybody soon, including myself. I intended to sleep there that night. The biggest mattress in the world, but better not smoke in bed.

Late in the afternoon I saw Harry Zimmerman sitting on an upturned box near the Land Rover, smoking and drinking a mug of tea. I sensed that he was waiting for me, though his opening remark was casual enough.

'Been a busy day,' he said.

'Sure has. And it'll be a busy night. I've got another job for you, anytime you're ready.' I dropped down beside him. 'Trade you for a mouthful of that gunfire, Harry.'

'What have you got to trade?' he asked as he handed over the mug. I took a swig and passed it back.

'Good soft bed for tonight.'

'Now you're talking. Anyone in it?'

'Sorry, only me – and probably all the rest of the crew. We may as well doss down in comfort for one night before handing the warehouse over to the medics.'

He was silent. for a spell and then said, 'Seen Russ about?'

'No. Why?'

'Just thought I'd mention it. He's spoiling for a fight. Can be nasty, once he's off and flying.'

It was a fair warning and I wasn't particularly surprised nodded my thanks and crossed to the Land Rover. Zimmerman seemed to be waiting for something to happen. It did. As I opened the door an object rolled off the seat and smashed at my feet. It was my bottle of Scotch, and it was quite empty.

'Russ did this, Harry?'

'I'm afraid so.'

He'd left the bottle where I'd find it; it was a direct challenge. There would have been just enough in it to put an edge on his appetite for supper, or for a brawl.

'Where is he?'

'Neil, Russ is one tough guy to tangle with. Be careful.'

I said, 'He's not going to hurt me. I'm going to straighten your buddy out.'

'Hell, he's not my buddy,' Zimmerman said, and there was an edge to his normally placid voice. 'We just work together. I've seen this before and I don't have a taste for it. He's having a game of poker with some of your guys.'

I picked up the pieces of glass and ditched ail but the largest which had the label still attached, and closed the car door. Zimmerman added, 'Watch his left. He has a sneaky curve punch there.'

'Thanks.'

I knew where to find Burns. One of the lamps leading from the generator cable had been looped over a tree so that the light shone on the ground below. Five men were sitting playing cards, using a suitcase as a table. I didn't notice who they were; I had eyes only for Burns. He played a hand casually but I knew he'd seen me arrive and his back had stiffened.

I stopped just outside the circle of light and said, 'Burns, come here. I want you.'

He looked up and shaded his eyes. 'Why, it's our top man,' he said. 'What can I do for you, Mannix?'

Cards went down all round the circle. I said, 'Come over here.'