The full purport of this discovery now came to me, and it filled me with frantic joy. For, since the cave connected with that platform beneath the cataract, it was evident that by crossing the ledge, a dangerous but not precarious feat, I should enter the main tunnel again and come out eventually beyond the hills, even allowing for a preliminary blunder into the wrong track.

The greatest danger lay in the possibility of Leroux or his aids lying in wait for me somewhere within the tunnel, and I had not much fear of that, for I did not believe they suspected that our cave connected with the main passage. It was more likely that they would wait in Duchaine's room till hunger drove us out.

So I started back to Jacqueline. But I had not gone six paces before I heard a scream that still rings in my ears to-day, and a shadow sprang out of the darkness and rushed at me. It was old Charles Duchaine.

His white hair streamed behind him; his face bore an expression of indelible horror and rage, and in his hand he held the other sword.

With a madman's proverbial cunning he had pretended to be asleep; then he must have followed me stealthily as I made my journey of exploration; and now, doubtless, he ascribed all his wrongs and sufferings to me and meant to kill me.

His fears had snapped the last frail link that bound him to the world of sense.

He struck at me, a great sweeping blow which would almost have cut me in two. I had just time to parry it, and then he was upon me, raining blows upon my out-stretched sword. He was no swordsman, but slashed and hewed in frenzy, and the steel rang on steel, and the rust from the blades filled my nostrils with its sting.

But, though his attack was wild, the vigor of his blows almost beat down my guard. At last a random blow of mine swept the weapon from his feeble old hand and sent it whirling down the cataract into the lake below.

Then he was at my throat, and it was fortunate that there was firm rock instead of slippery ice beneath us, or we should both have followed the sword.

He linked his arms around me and wrestled furiously, and his weight and height so much surpassed my own that they compensated for his weakness.

We swayed backward and forward, and the star dipped and swung over us, as though we stood upon the deck of a rolling ship.

"Calm yourself, for Heaven's sake, _monsieur_!" I gasped as I gained a momentary advantage over him. "Don't you know me? I am your friend.

I want to save you!"

But he was at me again, trying to lock his hands about my throat; and, even after I had controlled him and pinned his arms to his sides, he fought like a fiend, and never ceased to yell. On either hand the rocks and tunnel gave back his howls with hideous echoes that rolled into the distance as though a hundred demons were at strife.

"You shall not take me! I have done nothing! It was years ago! Let me go! Let me go!" he screamed.

I released him for a moment, hoping that his disordered brain would calm enough for him to recognize me, and that, when he saw my motives were peaceful, he would grow quiet.

But suddenly, with a final howl, he sprang past me, Sweeping me against the wall, and leaped out on the ledge.

I held my breath. I expected to see him stagger to his death below.

But he stood motionless in the middle of the little platform and stretched out his arms toward the raging torrent, as though in invocation. Then he leaped across with the agility of a wild sheep and rushed on into the tunnel beyond.

I drew my breath thickly and leaned against the wall, overcome with nausea. The physical shock of the struggle was, however, less appalling than the thought of Jacqueline.

I had no hope that the old man would ever return, or that his crazed brain remembered the way home to the cave. He would wander on through the tunnels, either to perish in them miserably, or to emerge at last into the snow beyond and die there.

Unless Leroux found him.

I started back, keeping this time to the right side of the tunnel, until I heard the gurgling of the brook. Then I heard Jacqueline's footstep.

"Who is it?" she called wildly. "M. Hewlett! My father!"

I caught her as she swayed toward me. "He has gone, Jacqueline," I said. "I went into the tunnel to try to find the way. He had been feigning sleep, and he crept after me. I tried to stop him. He was so frightened that I thought it best to let him go. He ran on into the tunnel----"

"We must find him," she said.

"He will come back, Jacqueline."

"He will never come back!" she answered. "He must have been planning this and waiting for me to sleep. For years he brooded over his danger, suspecting everybody, and the shock of last night unhinged his mind. He may be hiding somewhere. We must search for him."

"Let us go, then, Jacqueline," I answered.

In fact, there seemed to be no use in remaining any longer. If Pierre were on his way back, we ought to meet him in the tunnel; and if he had been captured, delay spelled ruin.

So I led her back into the tunnel on what was to be, I hoped, our final journey. We reached the ledge. The star had faded now, and the whole sky was bright with the red clouds of dawn.

Very cautiously we picked our way across the platform, clinging to the wall. It was a hideous journey over the slippery ice, beneath the thunder of the cataract; and when at length we reached the tunnel on the other side, I was shaking like a man with a palsy.

But, thank God, that nightmare was past. And with renewed confidence I went on through the darkness, with Jacqueline at my side, feeling my way by the deeper depression in the ground along the centre of the tubular passage.

At length I saw daylight ahead of me--and there was no sound of the torrents.

Fortune had led us where I had wanted her to lead--into the open space where the gold was. From there I knew that I could strike the passage which led into the sleigh road under the hills. Half an hour's travel ought to bring us to the rocking stone at the entrance, and safety.

But I found that I had entered the mine from a third point, and that some forty feet away from the place where I had emerged before. This time we were inside the cave in which Leroux and Lacroix had piled the sacks of earth.

I was looking out beyond them toward the rivulet, and on my right hand and on my left the tunnel stretched away, leading respectively toward the _chateau_ and to the rocking stone at the entrance.

I left Jacqueline in the cave for a few moments and went into the smaller one near by, where I had seen the provisions on the preceding day. I found a small box of hard biscuit, with which I stuffed the pockets of my coat, and, happier still, a small revolver and some cartridges, to which I helped myself liberally.

Then I went back to Jacqueline.

We must go on. Half an hour more should see us outside the tunnel beyond the mountains. And this was the day on which Pere Antoine would be expecting me.

It seemed incredible that so much could have happened in four-and-twenty hours.

But there was no sign of Charles Duchaine. And I did not intend to jeopardize our future for the sake of the crazed old man.

"Jacqueline," I said, "let us go on. Perhaps your father is on his way outside the tunnel."

She shook her head. "We must find him first," she answered.

"But that is impossible," I protested. "How can we go wandering among these dark passages when we do not know where he has gone? You know he is invaluable to Leroux, and he will come to no harm with him. If we get free, we can return with aid and rescue him."

"We cannot go without my father," she answered, shaking her head in determination.

"But----"

"Oh, don't you see that we _must_ find him?" she cried wildly. "But _you_ must go. You cannot be burdened with me. Give up your hopeless mission to rescue us, _monsieur_, and save yourself!"

At that my hopes, which had been so high, went crashing down.

"Jacqueline," I said, "if we can find your father you will come with me? Because it has occurred to me," I went on, "that if he had come this way, his footprints would be in the mud beside the stream. It would take an hour or two for them to fill up again. So, perhaps, he did not come this far, but is hiding in some cave in the tunnel through which we came. Will you wait for me here while I go back and search?"

She nodded, and I went back into that interminable tunnel again.