I looked at Jackstraw, and he at me. The man who had so recently knocked me out had been desperate all right. I knew then what I had subconsciously known all along, that I was dealing blindfolded against a man—or men—far cleverer than myself. They knew that Joss couldn't possibly have hoped to repair the RCA. They knew, therefore, that I must have been talking direct to Hillcrest. They knew, because I had told them, that the eight-watt radio we had with us had a range of not more than 150 miles under normal conditions, so that the chances were high that Hillcrest was actually speaking from the IGY cabin—or a point even nearer. I had also told them that Hillcrest and his four companions wouldn't be returning from their field trip for another two or three weeks, so that this premature return could only be accounted for by some unforeseen and extraordinary event. It wasn't hard to guess what that event must have been. That I should ask Hillcrest to find out the reason for the crash followed inevitably, but what was not inevitable, what pointed most clearly of all to the shrewdness of the killers, was their guess that whoever knew the reason for the crash would be most reluctant to go into specific detaiclass="underline" and they had robbed me of the only clue that might have helped me discover what that detail was and so also, I felt sure, the identity of the killers. But the time was far past now for crying over spilt milk.
I pressed the switch to Transmit'.
"Thank you. But please radio Uplavnik again, emphasise desperate urgency of finding out crash reasons. . . . How far behind do you estimate you are now? We have made only twenty miles since noon. Cold extreme, bad radiator trouble. Over."
"We have made only eight miles since noon. It seems—"
I threw the switch over.
"Eight miles?" I demanded harshly. "Did I hear you say eight miles?"
"You heard." Hillcrest's voice was savage. "Remember the missing sugar? Well, it's turned up. Your fine friends dumped the whole bloody lot into the petrol. We're completely immobilised."
CHAPTER NINE—Wednesday 8 P.M.—Thursday 4 P.M.
We were on our way again just after nine o'clock that night. It had been my original intention, by dreaming up a variety of excuses and even, if necessary, by sabotaging the engine, to stay there for several hours or at least what I reckoned to be the longest possible time before the killers became restive, suspected that I was deliberately stalling, and took over. Or tried to take over. For it had been my further intention that, after an hour or two, Jackstraw should produce his rifle—it was strapped to his shoulders night and day—and I my automatic, and hold them all at the point of the gun until Hillcrest came up. If all had gone well, he should have been with us by midnight. Our troubles would have been over.
But it had not gone well, our troubles were as bad as ever, the Sno-Cat was bogged down and with Mahler now seriously ill and Marie LeGarde frighteningly weak and exhausted, I couldn't remain any longer. Had I been made of tougher stuff, or even had I not been a doctor, I might have brought myself to recognise that both Marie LeGarde and Theodore Mahler were expendable pawns in a game where the stakes, I was now certain, were far greater than just the lives of one or two people. I might have held everybody—or the major suspects, at least—at gunpoint until such time, twenty-four hours if need be, as Hillcrest did come up. But I could not bring myself to regard our sick passengers as expendable pawns. A weakness, no doubt, but one that I was almost proud to share with Jackstraw, who felt exactly as I did.
That Hillcrest would come up eventually I felt pretty sure. The dumping of the sugar in the petrol—I bit my lips in chagrin whenever I remembered that it had been I who had told them all that Hillcrest was running short of fuel—had been a brilliant move, but nothing more, now, than I had come to expect of men who thought of everything, made every possible provision against future eventualities. Still, even though furiously angry at the delay, Hillcrest had thought he could cope with the situation. The big cabin of the Sno-Cat was equipped with a regular workshop with tools fit to deal with just about every mechanical breakdown, and already his driver-mechanic-1 didn't envy him his murderous task even though he was reportedly working behind heated canvas aprons—had stripped down the engine and was cleaning pistons, cylinder walls and valves of the unburnt carbon deposits that had finally ground the big tractor to a halt. A couple of others had rigged up a makeshift distillation unit—a petrol drum, almost full, with a thin metal tube packed in ice leading from its top to an empty drum. Petrol, Hillcrest had explained, had a lower boiling point than sugar, and when the drum was heated the evaporating gas, which would cool in the ice-packed tube, should emerge as pure petrol.
Such, at least, was the theory, although Hillcrest didn't seem absolutely sure of himself. He had asked if we had any suggestion, whether we could help him in any way at all, but I had said we couldn't. I was tragically, unforgivably wrong. I could have helped, for I knew something that no one else did, but, at the moment, I completely forgot it. And because I forgot, nothing could now avert the tragedy that was to come, or save the lives of those who were about to die.
My thoughts were black and bitter as the tractor roared and lurched and clattered its way south-west by west under the deepening darkness of a sky that was slowly beginning to fill with cloud. A dark depression filled me, and a cold rage, and there was room in my mind for both. I had a strange fey sense of impending disaster, and though I was doctor enough to know that it was almost certainly a psychologically induced reaction to the cold, exhaustion, sleeplessness and hunger—and a physical reaction to the blow on the head—nevertheless I could not shake it off: and I was angry because I was helpless.
I was helpless to do anything to protect any of the innocent people with me, the people who had entrusted themselves to my care, the sick Mahler and Marie LeGarde, the quiet young German girl, the grave-faced Margaret Ross—above all, I had to admit to myself, Margaret Ross: I was helpless because I knew the murderers might strike at any time, for all I knew they might believe that Hillcrest had already told me all I needed to know ana that I was just waiting my chance to catch them completely off guard; on the other hand they, too, were almost certainly just biding their time, not knowing how much I knew, but just taking a calculated gamble, letting things ride as long as the tractor kept moving, kept heading in the right direction, but prepared to strike once and for all when the time came: and, above all, I was helpless because I still had no definite idea as to who the killers were.
For the hundredth time I went over everything I could remember, everything that had happened, everything that had been said, trying to dredge up from the depths of memory one single fact, one isolated word that would point the finger in one unmistakable direction. But I found nothing.
Of the ten passengers Jackstraw and I had with us, six of them, I felt certain, were almost beyond suspicion. Margaret Ross and Marie LeGarde were completely beyond it. The only things that could be said against Mrs Dansby-Gregg and Helene was that I hadn't absolute proof of their innocence, but I was certain that such proof was quite unnecessary. United States senators, as recent bribery and corruption cases had lamentably shown, had as many human failings—especially cupidity—as the next man: but, even so, the idea of a senator getting mixed up with murder and criminal activities on this massive scale was too preposterous to bear further examination. As for Mahler, I was quite aware that being a diabetic didn't bar a man from criminal pursuits, and he could have been one of the guilty men—just possibly, he had thought they would force-land near some easily available insulin supplies. But that was just a little too far-fetched, and even if it weren't, I wasn't seriously interested in Mahler. I was concerned with killers who might kill again at any moment, and he most certainly wasn't included in that category: Mahler was a dying man.