Calling up Joss was only a gesture. I'd made a promise and was keeping it, that was all. But by this time, I estimated, we were 120 miles distant from him, near enough the limit of our small set: I didn't know what effect the intense cold would have on radio transmission, but I suspected it wouldn't be anything good: there had been no aurora that morning, but the ionosphere disturbance might still be lingering on. and, of course, Joss himself had declared that his RCA was entirely beyond repair.

Ten minutes passed, ten minutes during which Jackstraw industriously cranked the handle and I sent out the call-sign, GFK three times repeated, a flick of the receiver switch, ten seconds listening, then the switch pulled back and the call-sign made again. At the end of the ten minutes I sent out the last call, pushed over the receiving switch, listened briefly then stood up, resignedly gesturing to Jackstraw to stop cranking. It was then, almost in the very last instant, that the mike in my hand crackled into life.

"GFX calling GFK. GFX calling GFK. We are receiving you faint but clear. Repeat, we are receiving you. Over."

I fumbled and nearly dropped the mike in my excitement.

"GFK calling GFX, GFK calling GFX." I almost shouted the words, saw Jackstraw pointing to the switch which was still in the receiving position, cursed my stupidity, threw it over, called out the signs again and then, quite forgetting the procedure and etiquette of radio communication, rushed on, the words tumbling over one another: "Dr Mason here. Dr Mason here. Receiving you loud and clear. Is that you, Joss?" I threw the switch.

"Yes, sir. Glad to hear from you." Static lent a flat impersonality to the crackling words, robbed them of meaning. "How are you? What weather, how far out?"

"Going strong," I replied. "Cold intense – minus 70°. Approximately 120 miles out. Joss, this is a miracle! How on earth did you fix it?"

"I didn't," he said unemotionally. There was a pause and then his voice came again. "Captain Hillcrest is waiting to speak to you, sir."

"Captain Hillcrest! What on earth is Captain Hillcrest – " I broke off abruptly, not through astonishment, great though that was, that Hillcrest, whom I had believed to be almost 250 miles to the north of our IGY cabin should have suddenly turned up there, but because the warning glance from Jackstraw had found an echoing answer in the back of my own mind. "Hold on," I said quickly. "Will call you back in two or three minutes."

We had set up the transmitter just to the rear of the tractor cabin, and I knew that every word said on both sides could be heard by those inside. It was just then that the curtains parted and Corazzini and Zagero peered out, but I ignored them. I never cared less about the hurt I was offering to anybody's feelings, just picked up the radio and generator while Jackstraw unstrung the antenna, and walked away from the tractor. Two hundred yards away I stopped. Those in the tractor could still see us – the brief light of noonday was flooding over the ice-cap – but they could no longer hear us.

We rigged the radio again, and I tried to tap out the call-sign but it was hopeless, we'd been out too long in that dreadful cold and my hand was beating an uncontrollable tattoo on the key. Fortunately, they knew or guessed at the other end what was happening, for Hillcrest's voice, calm, confident, infinitely reassuring, came through as soon as I pressed the receiving switch.

"Surprise, surprise," the mike crackled mechanically. "OK, Dr Mason, from what Joss has said – and the recent delay -1 guess you're a good way from the tractor. At seventy below you won't want to stay there too long. Suggest I do all the talking. I'll keep it brief. Receiving me?"

"Loud and clear. What on earth are you – sorry, carry on."

"Thanks. We heard Monday afternoon, on both British and American broadcasts, of the overdue airliner. Tuesday morning -yesterday, that is – we heard from the Uplavnik base. They say this hasn't been announced officially, but the US and British governments are convinced that the plane has not been lost at sea, but that it has landed somewhere in Greenland or Baffin Island. Don't ask me why they're convinced – I've no idea. Anyway, they've mounted the biggest air-sea rescue search since the war. Merchant vessels of several nationalities have been diverted. American, British, French and Canadian fishing trawlers are moving in to the Greenland coast – the west coast mainly. The east's already blocked with ice. A dozen US air force search bombers are already operating from Thule and Sondre Strom-fjord. US coastguard cutters are on the job, a flotilla of Canadian destroyers have been rerouted from mid-Atlantic and are steaming at full speed for the southern entrance of the Davis Strait – although it will take them at least thirty-six more hours to get there – and a British aircraft-carrier, accompanied by a couple of destroyers, has already rounded Cape Farewell: we don't know yet how far north she can get, the ice is solid on the Baffin side, but it's open at least to Disko on the Greenland coast, maybe as far as Svartenhuk. All IGY stations in Greenland have been ordered to join in the search. That's why we came back non-stop to the cabin – to pick up more petrol."

I could contain myself no longer, threw over the receiving switch.

"What on earth's all the mad flap about? You'd think the President of the United States and half the Royal Family were aboard that plane. Why no more information from Uplavnik?"

I waited, and then Hillcrest's voice crackled again.

"Radio transmission impossible during preceding twenty-four hours. Will raise them now, tell them we've found the missing plane and that you're on your way to the coast. Any fresh developments with you?"

"None. Correction. One of the passengers – Mahler – turns out to be an advanced diabetic. He's in a bad way. Radio Uplavnik to get insulin. Godthaab will have it."

"Wilco," the microphone crackled back. A long pause, during which I could faintly hear the murmur of conversation, then Hillcrest came on again. "Suggest you return to meet us. We have plenty of petrol, plenty of food. With eight of us on guard instead of two, nothing could happen. We're already forty miles out" -1 glanced at Jackstraw, caught the sudden wrinkling of the eyes which I knew to be the tell-tale sign of a quick grin of astonished delight which so accurately reflected my own feelings – 'so not more than eighty miles behind you. We could meet up in five or six hours."

I felt elation wash through me like a releasing wave. This was wonderful, this was more than anything I had ever dared hope for. All our troubles were at an end. . . . And then the momentary emotion of relief and triumph ebbed, the cold dismaying processes of reason moved in inexorably to take their place, and it didn't require the slow, definite shake of Jackstraw's head to tell me that the end of our troubles was as far away as ever.

"No go," I radioed back. "Quite fatal. The minute we turned back the killers would be bound to show their hand. And even if we don't turn they know now that we've been in contact with you and will be more desperate than ever. We must go on. Please follow at your best speed." I paused for a moment, then continued. "Emphasise to Uplavnik essential for our lives to know why crashed plane so important. Tell them to find out the passenger list, how genuine it is. This is absolutely imperative, Captain Hillcrest. Refuse to accept 'No' for an answer. We must know."

We talked for another minute, but we'd really said all there was to be said. Besides, even during the brief periods that I'd pushed down my snow-mask to speak the cold had struck so cruelly at my cut and bleeding lips that I could now raise scarcely more than a mumble, so after arranging an 8 p.m. rendezvous and making a time-check I signed off.