O I hae killed my reid-roan steid,

could only fully trust the other. They could, of course, as could all the others, trust Marie LeGarde and Margaret Ross: but the fact that they knew that Marie LeGarde and Margaret Ross couldn't trust them was enough to prohibit any attempts to establish an easier relationship. As for Corazzini, the Rev. Small wood, the Senator and Mahler, they kept very much to themselves. In the circumstances, then, it was inevitable that they should welcome the introduction of an absolutely innocuous subject of interest and conversation, something that would ease, however slightly, the coldness and discomfort of the social atmosphere, something that would divert their unwelcome and suspicious thoughts into some more tolerable channel. Theodore Mahler promised to be the best looked after patient I had ever had. I had just got the oil stove going to my satisfaction when Zagero called to me from his seat by the rear canvas screen. "There's somethin' funny goin' on outside, Doc. Come and have a look." I had a look. Far off to the rightthe north-west, that wasand high above the horizon a great diffuse formless volume of luminosity, spreading over almost a quarter of the dark dome of the sky, was beginning to pulse and fade, pulse and fade, strengthening, deepening, climbing with the passing of every moment. At first it was no more than a lightening in the sky, but already it was beginning to take form, and faint colours beginning to establish themselves in definite patterns. "The Aurora, Mr Zagero," I said. "The Northern Lights. First time you've seen it?" He nodded. "Yeah. Amazin' spectacle, ain't it?" "This? This is nothing. It's just starting up. It's going to be a curtainyou get all sorts, rays, bands, coronas, arcs and what have you, but this is a curtain. Best of the lot." "Get this sort of thing often, Doc?* "Every day, for days on end, when the weather is like thisyou know, cold and clear and still. Believe it or not, you can even get so used to it that you won't bother looking." "I don't believe it. It's amazin'," he repeated, "just amazin'. Tired of it, you say -1 hope we see it every day." He grinned. "You don't have to look, Doc." "For your own sake you'd better hope for something else," I said grimly. "Meanin'?" "Meaning that radio reception is hopeless when the aurora is on." "Radio digital cameras that make mpeg movies reception?" He crinkled his brows. "What we gotta lose, with the radio set in the cabin smashed and your friends in the trail party gettin' further away every minute? You couldn't raise either of them anyway." "No, but we can raise our Uplavnik base when we get a bit nearer the coast," I said, and the next moment I could have bitten my tongue off. I had never even thought of the matter until then, but as soon as the words were out I realised that I should have kept this piece of knowledge to myself. The chances of Uplavnik listening in at the right time and on the right frequency were remote enough, but it was always a chance: we could have sent out a warning, summoned help long before the killers would have thought of making a break for it. But, now, if Zagero were one of the killers, he would make good and certain that the set would be smashed long before we got within radio range of the Uplavnik base. I cursed myself for a blundering idiot, and stole a quick glance at Zagero. In the light streaming out from the gap in the curtain and in the fainter light of the aurora, his every feature was plain, but I could tell nothing from his expression. He was playing it casual, all right, but not too stupidly casual. The slow nod, the pursing of the lips, the thoughtful lifting of the eyebrows could not have been improved upon. Not even the best professional actor could have improved on it, and hard on the heels of that came the second thought that there were a couple of extraordinarily fine actors among us. But, then, if he hadn't reacted at all, or had reacted too violently, I would have been doubly suspicious. Or would I? If Zagero were one of the guilty men, wouldn't he have known that too much or too little reaction would have been the very thing to excite suspicion, and taken due precaution against registering either? I gave it up and turned away. But in my mind there was growing a vague but steadily strengthening suspicion against Johnny Zagero: and on the basis of the success and validity of my previous suspicions, I thought bitterly, that just about guaranteed Zagero's innocence. I turned and touched Margaret Ross on the shoulder. "I'd like to have a few words with you, Miss Ross, if you don't mind the cold outside." She looked at me in surprise, hesitated for a moment, then nodded. I jumped down, reached up a hand to steady her, then helped her aboard