The autumn frosts will lie upon the grass

taking chances. And whoever held the other end of the rope up above was moving even as quickly as I was, for the rope tightened just as I finished tying the knot. I learned later that Helene owed her life to Mahler's quick thinking. The dog-sledge carrying Marie LeGarde and himself had stopped directly opposite the spot where Helene had gone over, and he had shouted to Brewster and Margaret Ross to sit on it and thread the rope through the slats on the sledge top. It had been a chance, but one that came off: even on that slippery surface their combined weights were more than enough to hold the slightly built Helene. It was then that I made my mistakemy second mistake of that afternoon, though I did not realise that at the time. To help those above I stooped to boost her up, and as I straightened abruptly the suddenly increased pressure proved too much for the already crumbling bridge. I heard the ominous rumble, felt the snow begin to give under my feet, released my hold on Heleneshe was already well clear anywaygrabbed Jackstraw by the arm and jumped for the other side of the bridge a second before the spot where we had been standing vanished with a whroom and went cascading down into the gloomy depths of the crevasse. At the full extent of my rope I hit the ice on the far side of the crevasse, wrapped both arms tightly round JackstrawI heard his muffled expression of pain and remembered his injury for the first timeand wondered how long I could hold him when that side of the bridge went too, as go it must, its support on the far side no longer existing. But, miraculously, for the moment it held. Both of us were pressed hard in against the ice, motionless, hardly daring to breathe, when I heard a sudden cry of pain from above. It came from Heleneshe must have caught her injured shoulder as she was being pulled over the edge of the crevasse. But what caught my eye was not Helene, but Corazzini. He was standing very close to the edge, and he had my gun in his hand. I have never known such chagrin, such profound despair, such bitterness of spiritor, to be utterly frank, such depths of fear. The one thing I had guarded against all the time, the one thing I had dreaded above all other things, that Jackstraw and I should ever find ourselves, at the same time, completely at the mercy of the killers, had come to pass. But even in my fear there was savagerysavagery towards the man who had engineered this so beautifully, savagery towards myself for having been so easily and utterly fooled. Even a child polaroid digital camera filter could see how it had been done. The series of snow-bridges had given Corazzini the idea. A little nudge to Helene Fleming at the right placeit was as plain as a pikestaff that it had been no accidentand it was a foregone conclusion that either Jackstraw or myself would have to go down to fix a rope round the youngster who, with her broken collar-bone, would be unable to do it herself: I suppose the possibility that she might have crashed straight through the snow-bridge must have occurred to Corazzini, but a man with a record of killings like he had wouldn't be worried unduly on that scoreannoyance at the failure of his plan would probably have been his only reaction. And when one of us had gone down and the other was supervising the rescue from abovewell, another little nudge would have solved all Corazzini's problems. As it was, I had played into his hands more completely than he could ever have hoped. Mouth dry, sweat breaking out in the palms of my clenched fists and my heart going like a trip-hammer in my chest, I was wondering desperately how he was going to administer the coup de grace when I saw the Rev. Smallwood approaching him arms outstretched and saying something I couldn't catch. It was a brave gesture of the little minister's, but a forlorn and hopeless one: I could see Corazzini change his gun to his left hand, strike Mr Smallwood a heavy backhanded blow across the face and the sound of a body falling on the ice above was unmistakable. And then Corazzini was waving the others back at the point of the gun and was advancing towards the wooden battens that straddled the crevasse, and I knew with a dull certainty how he intended to dispose of us. Why waste two bullets when all he had to do was to kick the edges of these battens over the side? Whether these . battens, weighing two hundred pounds between them, struck us or smashed away the last remaining buttress of the snow-bridge was quite immaterial: the point was that I was inescapably attached to them by the nylon rope round my waist, and when they plummeted down I would go with them, tearing away the bridge and carrying Jackstraw with me to our deaths in the unthinkable depths below. Despairingly, I considered the idea of snatching at the rifle still strapped to Jackstraw's back, but dismissed it even with the thought. It would take me seconds to get it off. There was only one thing for it, and it wasn't going to do me any good at