Hamilton reached out and touched Silver's arm. 'I'll bet you couldn't do that again.'

Silver dabbed at his wounded cheek. 'I wouldn't ever care to try.' If he was in any way proud of his magnificent airmanship it didn't show.

'Out! All out!' Smith's voice was a stentorian shout, he seemed unaware that normal conversational tones were again in order. 'We can go up any moment.'

'Don't be so silly.' Hamilton sounded weary. 'Ignition's off. Stay put.'

'If I want to go out -'

'Then that's your business. n.o.body's going to stop you. Later on, we'll bury your boots.'

'What the h.e.l.l is that meant to mean?'

'A civilised interment of the remains. Maybe even those won't be left.'

'If you'd be-'

'Look out your window.'

Smith looked at Hamilton then turned to the window, standing so as to achieve a ground view. His eyes widened, his lips parted and his complexion changed for the worse. Two very large alligators were only feet from the helicopter, fearsome jaws agape, their huge tails swinging ominously from side to side. Wordlessly, Smith sat down.

Hamilton said: 'I warned you before you left, the Mato Grosso is no place for mindless little children. Our two friends out there are just waiting for such children. And not only those two. There'll be more around, lots of them. Also snakes, tarantulas and suchlike. Not to mention --' He broke off and pointed to the port windscreen. 'I'd rather you didn't have to but take a look anyway.'

They did as he asked. Among the trees on the left bank could be seen a number of huts, perhaps twenty in all with an especially large circular one in the centre. Several columns of smoke shimmered up into the morning air. Canoes, and what looked like a pinnace, fronted the village. A large number of natives, nearly naked, stood on the bank, talking and gesticulating.

'But this is luck,' Smith said.

'You should have stayed in Brasilia.' Hamilton sounded unwontedly sour.

'Sure it's luck -- the most fiendishly bad luck. I see the chiefs are getting ready.'

There was a fairly long silence then Maria said almost in a whisper: 'The Chapate?'

'None else. Complete, as you can now see, with olive branches and calling cards.'

Every native ash.o.r.e was now armed or was in the process of getting armed. They carried spears, bows and arrows, blowpipes and machetes.

.The angry expressions on their faces went well with the menacing gesticulations in the direction of the island.

'They'll be calling soon,' Hamilton said, 'and not for tea. Maria, would you give Mr Silver a hand to fix up his face?'

Tracy said: 'But we're safe here, surely? We have guns, plenty. They're carrying nothing that could penetrate our screens, far less the fuselage.'

'True. Ramon, Navarro, get your rifles and come with me.'

Smith said: 'What are you going to do?'

'Discourage them. From crossing. Shame, really. They may not even know what a gun is.'

'Tracy made sense,' Smith said. 'We're safe here. You have to be a hero?'

Hamilton stared at him until Smith looked uncomfortable. Hamilton said: 'Heroism doesn't enter into it, just survival. I wonder whether you would be half-way brave enough to fight for your own survival. I suggest you leave this to someone who knows how the Chapate wage war. Or do you want to be ready for immediate consumption when they get you?'

'What's that supposed to mean?' Smith tried to sound bl.u.s.tery but his heart wasn't in it, his ego had been too severely dented.

'Just this. If they get as much as a foothold on this island the first thing they'll do is to set fire to the undergrowth and roast you alive in this metal coffin.'

There was a silence that lasted until Hamilton, Ramon and Navarro had left the helicopter.

Ramon, the first to touch the ground, had his rifle on the nearest alligator immediately but the precaution proved needless: both alligators immediately turned and scuttled away into the undergrowth.

Hamilton said: 'Just keep an eye on our backs, Ramon.' Ramon nodded.

Hamilton and Navarro moved towards the rear, took shelter behind the tail of the helicopter and looked cautiously ash.o.r.e.

A squat, powerfully built Indian dressed in a pink feather head-dress, teeth necklace, a series of arm bracelets and little else -- definitely the chief -- was ordering warriors into half-a-dozen canoes. He himself was standing on the bank.

Navarro looked at Hamilton, his reluctance plain. He said: 'No choice?'

With equal regret Hamilton agreed, shaking his head. Navarro lifted his rifle, aimed and fired in one swift motion. The report of the rifle momentarily paralysed all activity on the bank. Only the chief moved: he cried out in pain and clutched his upper right arm. A second later, while the warriors were still immobilised in shock, another report was heard and another warrior struck in precisely the same place. Navarro was clearly a marksman of the most extraordinary accuracy.

Navarro said: 'Not nice, Senor Hamilton.'

'Not nice. As the old saying goes, it's people like us who have made people like them what they are. But this is hardly the time and place to explain that to them.'

Ash.o.r.e the warriors rapidly abandoned their canoes and ran for the shelter of their huts and the forest, taking the two wounded men with them. From those shelters they could be seen almost immediately drawing bows and lifting blowpipes to their mouths. Hamilton and Navarro prudently dropped behind cover as arrows and darts rattled and rebounded harmlessly off the fuselage. Navarro shook his head in sorrow and wonderment. 'I'il bet they've never even heard a rifle report before. It is something less than a fair contest, Senor Hamilton.'

Hamilton nodded, but made no comment for comment would have been superfluous. He said: 'That's all for now. I don't think they'll try anything again before dark. But I'll keep watch -- or arrange for others to do it. Meantime, you and Ramon get rid of our four-legged friends and the creepy-crawlies. Try to chase them away, shoo them away. If you have to shoot, for goodness sake don't do it by the water's edge or in the water. Bath-time tonight and I don't want to attract every piranha for miles around.'

Hamilton reboarded the helicopter. Tracy said: 'That was quite a hailstorm out there. Arrows and darts, I a.s.sume?'

'Didn't you see?'

'I wasn't too keen on looking. I'm sure those windows are made of toughened gla.s.s but I wasn't going to be the one to put them to the test. Poisoned?'

'Certainly. But, almost equally certainly, no curare, nothing lethal.

They have a less final but equally effective poison that merely stuns.

Too much curare affects the flavour of the stew.'

Smith said sourly: 'You certainly have a' summary way of dealing with the opposition.'

'I should have parleyed with them? The brightly coloured beads approach?

Why don't you go and try it?' Smith said nothing. 'If you have any futile suggestions to offer, I suggest you either translate them into action or shut up. There's a limit to the number of niggling remarks a man can take.'

Silver, his face bandaged, intervened pacifically. 'And now?'

'A lovely long siesta until dusk. For me, that is. I shall have to ask you to take turns in keeping watch. Not only the village, but as far upstream and downstream as you can see - the Chapate might contemplate launching a canoe attack at some distance from their village although I consider it highly unlikely. If anything happens, let me know. Ramon and Navarro should be back in twenty minutes; don't bother letting me know.'

Tracy said: 'You place a great deal of faith in your lieutenants.'

'Total.'

Smith said: 'So we keep awake while you sleep. Why?'

'Recharging my batteries for the night ahead.'

'And then?'

Hamilton sighed. 'This helicopter, obviously, will never be airborne again so we have to find some other means of rejoining the hovercraft, which I reckon must be about thirty miles downstream. We can't go by land. It would take us days to hack our way down there and, anyway, the Chapate would get us before we covered a mile. We need a boat. So we'll borrow one from the Chapate. There's a nice, big and very ancient motor launch moored to the bank there. Not their property for a certainty: the original owners were probably eaten long ago. And the engine will be a solid block of rust and quite useless. But we don't need power to go downstream.'

Tracy said: 'And how do you propose we -- ah -obtain this boat, Mr Hamilton?'

'I'il get it. After sunset.' He smiled faintly. 'That's why I intend recharging my batteries in advance.'

Smith said: 'You really do have to be a hero, Hamilton, don't you?'

'And you'll really never learn, will you? No, I don't have to be a hero. I don't want to be a hero. You can go instead. You be the hero. Go on.

Volunteer. Impress your girl-friend.'

Smith slowly unclenched his fists and turned away. Hamilton sat and appeared to compose himself for slumber, oblivious of the dead Heffner laid now across the aisle from him. The others looked at one another in silence.

It was many hours later, at dusk, when Hamilton said: 'Everything packed? Guns, ammunition, last night's overnight bags, food, water, medicines. And Silver, the chopper's two compa.s.ses might come in handy.'

Silver indicated a box by his feet. 'They're already in there.'

'Excellent.' Hamilton looked around him. 'Well, that seems to be all.

Heigh-ho, I think.'

'What do you mean, that seems to be all?' Smith said. He nodded towards the dead Heffner. 'How about him?'

'Well, how about him?'

'You going to leave him here?'

'That's up to you.' Hamilton spoke with an almost ma.s.sive indifference.

He did not have to spell out his meaning. Smith turned and stumbled , down the helicopter steps.

At the downstream end of the island, only Navarro, of all the party, was absent. In the gathering darkness Hamilton again checked all the various packs. He seemed satisfied.

'There will be a moon,' he said, 'but it will be too late to save us.

Moonrise is in about two and a half hours. When they attack -- there's no "if" about it -- it must be inside those two and a half hours, which means it could be any time now although I should guess that they'll wait a bit until it is as dark as possible. Ramon, join Navarro now. If they attack before you get my signal, hold them off as best you can for as long as you can. If my signal comes first, get back here at once.

Tracy?'

Tracy said: 'I can tell you, I haven't been too happy here for the past hour. No, no alligators. No sign. Not a ripple. No gun?'

'Guns make noises. Guns get wet.'

Maria shivered and pointed to his big sheath knife. 'And that does neither?'

'Sometimes the first blow doesn't kill. Then there can be a lot of noise. But no heroics. I don't expect to have to use it. If I do, it means I've botched my job.'

Hamilton looked out across the river. The darkness had now so deepened that the sh.o.r.eline was no more than a dimly seen blur. He checked that the coil of rope, the waterproof torch and the sheath knife were securely attached to his waist, walked noiselessly into the river and then slowly, silently, began to swim.

The water was warm, the current was gentle and around him he could see nothing but the calm dark water. Suddenly, he stopped swimming, trod water and stared ahead. He could see what he imagined to be a tiny ripple in the black smoothness without being able to see what caused it.

His right hand came clear of the water, clenched round the haft of his sheath knife. The tiny ripple was still there but even as he strained to watch it, it disappeared. Hamilton replaced the knife in its sheath. He wasn't the first person to have mistaken a drifting log for a crocodile, a considerably healthier position than the other way round. He resumed his silent swimming.

A minute later he drifted in towards the bank and caught hold of a convenient tree root. He straightened, paused, looked carefully around, listened intently then emerged swiftly and silently from the river and disappeared into the forest.

A hundred yards brought him to the perimeter of the village. There were at least a score of native huts, haphazardly arranged, none of them showing any sign of life. In their approximate centre was the much larger circular hut: light could be seen through the numerous c.h.i.n.ks in its walls. Ghostlike, Hamilton moved off to his right and moved round the perimeter of the village until he was directly to the rear of the large hut. Here he waited until he was sure -- or as sure as he could possibly be -- that he was alone then moved forward to the rear of the hut. He selected a small, lighted c.h.i.n.k in the wall and peered through it.

The communal hut was illuminated by some scores of tallow tapers. It was completely unfurnished. Dozens of natives were standing several deep round a cleared s.p.a.ce in the middle where an elderly man was using a stick to make a diagram on the sand-covered floor while at the same time explaining something in an unintelligible tongue. The diagram was the outline of the island. Also shown was the left bank of the river on which the village stood. The speaker had drawn lines from the village, from above the village and from below the village, all towards the island. A multi-p.r.o.nged attack was to be launched on the helicopter and its pa.s.sengers. The lecturer lifted his stick from time to time and pointed it at various natives: it was apparent that he was allocating canoe crews for their lines of attack.

Hamilton moved away in the direction of the upper river bank, still circling the village perimeter. As he pa.s.sed the last hut, he stopped.

At least twenty canoes, some quite large, were tethered to the bank.

Almost at the end of the row, upriver, was the dilapidated, paintflaked motor launch, a little over twenty feet in length. It was deep in the water but floating so to that extent might be deemed riverworthy.

Two Indian warriors, talking quietly, stood guard at the downstream end of the row of canoes. As Hamilton watched, one of them gestured towards the village and walked away. Hamilton moved around to one side of the hut and crouched there: the Indian walked by on the other side.

Another problem had arisen, one that Hamilton could well have done without. Even fifteen minutes ago he could have remained where he had been and the remaining Indian could have come within a few feet without seeing him. Not any more. The sun was gone, moonrise was still some time away, but, unfortunately, the evening clouds which, earlier, had so obligingly offered concealment, had pa.s.sed away and the southern skies were alive with stars - and in the tropics stars always seem so much bigger and brighter than they do in temperate climes. Visibility had become disconcertingly good.

Hamilton knew that the last thing he could afford to do was to wait. He straightened and advanced soundlessly, knife held in the throwing position. The Indian was gazing out towards the island, now quite visible. A shadow appeared behind him and there came the sound of a sharp but solid blow as the haft of Hamilton's knife caught him on the base of the neck. Hamilton caught him as he was about to topple into the water and lowered him none too gently to the bank.

Hamilton ran upstream. He came to the motor launch, pulled out his signal torch, hooded the beam with his hand and shone it inside.

The launch was filthy and had at least four inches of water in the bottom. The torch beam lit on the centrally positioned engine which, as Hamilton had expected, was now no more than a solid block of rust.

Floating incongruously in its vicinity were three cooking pans, obviously intended as bailers, at a guess the property of some optimistic but now departed missionaries. The beam played swiftly around the entire interior of the boat. There was no means of propulsion whatsoever: no mast, no sail, no oars, not even a solitary paddle.

Hamilton straightened and moved quickly to examine some of the nearest canoes. Within a minute he had collected at least a dozen paddles. He deposited those in the launch, hurried away, selected two large canoes and pulled them close to the launch. He unwound the rope around his waist, cut off two sections and used those to tie the canoes in tandem to the launch. He sliced through the manila painter, pushed the launch into deeper water, scrambled in, seized a paddle and began to move silently away from the bank.

Paddling the launch -- and its attendant canoes -- diagonally downstream, Hamilton was soon making heavy weather of it. The launch was naturally c.u.mbersome and made more so by the amount of water in it and Hamilton, able to use only one paddle, had to switch continuously from side to side to keep it on course. Briefly, he paused, located what he could discern to be the upstream end of the island, now almost directly opposite him, pulled out his torch and pressed the b.u.t.ton three times.

He then pointed his torch diagonally downstream and flashed again three times. He replaced his torch and resumed paddling.

Ash.o.r.e, an Indian warrior emerged from the communal hut, and walked casually towards the upper river-bank. Suddenly, he hurried forward and stooped over an Indian lying face-down on the bank. A trickle of blood was coming from what was the beginning of a ma.s.sive bruise on the base of his neck. His fellow tribesman straightened and began to shout, repeatedly and urgently.

Hamilton momentarily ceased paddling and glanced involuntarily over his shoulder. Then he bent himself again to his task but with even more energy this time.