He walked away for about fifty yards, taking the machine with him: it was with intense chagrin that I realised that it was perfectly in keeping with all that had gone before that Corazzini had probably forgotten more about navigation than I was ever likely to know. He returned soon, consulted a small chart – correcting for variation, no doubt – then grinned at Small wood.

"It's them, all right. Perfect signal. Bearing 268."

"Good." If Smallwood felt relieved or gratified at the news, no shadow of his feeling touched the thin immobile face. Their quiet certainty, their forethought, their foolproof organisation was dismaying, frightening. Now that I could see what manner of men they were it was unthinkable that they should have set themselves down in a vast featureless country such as this without some means of orientating themselves: what we had just seen in operation could only be a battery operated radio direction finder, and even to me, inexperienced though I was in such matters, it was obvious that Corazzini must have been taking a bearing on some continuous directional line-up signals transmitted by a vessel, or vessels, off-shore: trawlers, probably, or some other inconspicuous type of fishing vessel. ... I would have been less than human had I not wanted to shake this absolute confidence.

"You've miscalculated the hornet's nest you've stirred up. The Davis Strait, the coast of Greenland is alive with ships and planes. The scout planes of the carrier Triton will pick up every boat that's larger than a skiff. The trawlers will never get away with it: they won't get five miles."

"They don't have to." Implicit in Corazzini's words was confirmation of the accuracy of my guess about trawlers. "There are such things as submarines. In fact there is one, not far from here."

"You still won't – "

"Be quiet," Smallwood said coldly. He turned to Corazzini. "Two hundred and sixty-eight, eh – due west more or less. Distance?"

Corazzini shrugged, said nothing: Smallwood beckoned to me.

"We'll soon find it. That map, Dr Mason – indicate our position, accurately."

"You can go to hell," I said briefly.

"I expected nothing else. However, I'm not blind and your clumsy attempts at concealment have done little to hide the growing attachment between yourself and the young lady here." I glanced quickly at Margaret, saw the faint colour beginning to stain the pale cheek and looked as quickly away. "I am prepared to shoot Miss Ross."

I never doubted him. I knew he'd do it in an instant. I gave him our position, he asked for another map, asked Jackstraw to mark our position on the second, and compared the two.

"They coincide," he nodded. "Fortunately for you." He studied the map briefly, then looked at Corazzini. "The Kangalak fjord, undoubtedly, at the foot of the Kangalak glacier. Approximately – "

"The Kangalak fjord," I interrupted. My voice was bitter. "Why the hell didn't you land there in the first place and save us all this?"

"The plane captain deserved to die," Smallwood said obliquely. His smile was wintry. "I had instructed him to put down on the coast just north of the fjord where our – ah – friends had reconnoitred a section of the ice-cap, three miles long and absolutely flat, that is the equal of the finest runway in Europe or America, and it wasn't until I saw the altimeter reading just before the crash that I realised he had deceived me." He made an impatient gesture and turned to Corazzini. "We waste time. Approximately sixty miles, you would say?"

Corazzini examined the map. "Yes, about that."

"So, come then, on our way."

"Leaving us here to starve and die of cold, I suppose?" I said bitterly.

"What becomes of you no longer concerns me," Smallwood said indifferently. Already, in a matter of minutes, it had become almost impossible to think of him, to remember him as the meek retiring minister we had known. "It is possible, however, that you might be foolish enough to take advantage of the cover of snow and darkness to run after us, waylay and try to overcome us. You might even succeed, even though unarmed. We must immobilise you, temporarily."

"Or permanently," Zagero said softly.

"Only fools kill wantonly and unnecessarily. Fortunately – for you – it is not necessary for my plans that you die. Corazzini, bring some rope from the sled. There's plenty of cord there. Tie their feet only. With their numbed hands it will take them an hour to undo their bonds: we will be well on our way by then." He moved his gun gently from side to side. "Sit in the snow. All of you."

There was nothing for it but to do as we were told. We sat down and watched Corazzini bring a hank of cord from the sled. He looked at Smallwood, and Smallwood nodded at me.

"Dr Mason first."

Corazzini gave his gun to Smallwood – they missed nothing, that pair, not even the remote possibility that one of us might try to snatch Corazzini's gun – and advanced on me. He knelt and had taken a couple of turns round my ankles when the truth struck me with the suddenness, the shocking impact of a physical blow. I sent Corazzini staggering with a violent shove and leapt to my feet.

"No!" My voice was hoarse, savage. "By God, you're not going to tie me up, Smallwood!"

"Sit down, Mason!" His voice was hard, whip-like, and the light from the tractor cabin was enough for me to see the rock-like pistol barrel centred between my eyes. I ignored it completely.

"Jackstraw!" I shouted. "Zagero, Levin, Brewster! On your feet if you want to live. He's only got one gun. If he starts firing at any of us, the rest go for him and get him – he can't possibly get us all. Margaret, Helene, Mrs Dansby-Gregg-first shot that's fired, run off into the darkness – and stay there!"

"Have you gone crackers, Doc?" The words came from an astonished Zagero, but for all that something namelessly urgent and compelling in my voice had got him to his feet, and he was bent forward, crouched like a great cat, ready to launch himself at Smallwood. "Want to get us all killed?"

"That's just what I don't want." I could feel my spine, the back of my neck cold with a cold that was not of the Arctic, and my legs were trembling. "Going to tie us up and leave us here? Is he hell! Why do you think he told us of the trawler, its position, the submarine and all the rest of it? I'll tell you why – because he knew it was safe, because he'd made up his mind that none of us would ever live to tell of these things." I was rattling the words out with machine-gun rapidity, desperate with the need to convince the others of what I was saying before it was too late: and my eyes never left the gun in Smallwood's hand.

"But – "

"No 'buts'," I interrupted harshly. "Smallwood knows that Hillcrest will be coming through here this afternoon. If we're still here – and alive – first thing we'd tell him would be Smallwood's course, speed, approximate position and destination. Within an hour the Kangalak glacier would be sealed, within an hour bombers from the Triton would have blasted him off the face of the glacier. Tie us up? Sure – and then he and Corazzini would shoot us at their leisure while we flopped around like birds with broken wings."

Conviction was immediate and complete. I couldn't see the faces of the others, but the fractional lowering of Smallwood's gun was enough to tell me.

"I underestimated you, Dr Mason," he admitted softly. His voice was devoid of all trace of anger. "But you almost died there."

"What's five minutes more or less?" I asked, and Smallwood nodded absently. He was already working out an alternative solution.

"You – you inhuman monster!" Senator Brewster's voice was shaking with fear or anger or both. "You were going to tie us up and butcher us like – like – " Words failed him for a moment, then he whispered: "You must be mad, Smallwood, stark raving mad."