I turned round, feeling a little foolish, and saw that from where I stood the ledge and part of the lake were in full view. I could see the spears still lying where they had been thrown down.

But as I looked the two Incas emerged from the pa.s.sage. They picked up the spears, walked to the raft, and again launched it and paddled toward the center of the lake.

I thought, "Here is my chance; I must make that ledge before they return," and I started forward so precipitately that I ran head on into a ma.s.sive boulder and got badly stunned for my pains. Half dazed, I went on, groping my way through the semidarkness.

The trail was one to try a llama. I climbed boulders and leaped across chasms and clung to narrow, slippery edges with my finger-nails.

Several times I narrowly escaped dumping myself into the lake, and half the time I was in plain view of the Incas on the raft.

My hands and feet were bruised and bleeding, and I had b.u.mped into walls and boulders so often that I was surprised when I took a step without getting a blow. I wanted those spears.

I found myself finally within a few yards of my destination. A narrow crevice led from where I stood directly to the ledge from which the Incas had embarked. It was now necessary to wait till they returned to the sh.o.r.e, and I drew back into the darkness of a near-by corner and stood motionless.

They were still on the raft in the middle of the lake, waiting, spear in hand. I watched them in furious impatience, on the border of mania.

Suddenly I saw a dark, crouching form outlined against a boulder not ten feet away from where I stood. The form was human, but in some way unlike the Incas I had seen. I could not see its face, but the alertness suggested by its att.i.tude made me certain that I had been discovered.

Vaguely I felt myself surrounded on every side; I seemed to feel eyes gazing unseen from every direction, but I could not force myself to search the darkness; my heart rose to my throat and choked me, and I stood absolutely powerless to make a sound or movement, gazing in a sort of dumb fascination at that silent, crouching figure.

Suddenly it crouched lower still against the black background of the boulder.

"Another second and he will be at my throat," I thought--but I stood still, unable to move.

But the figure did not spring. Instead, it suddenly straightened up to almost twice the height of an Inca, and I caught a glimpse of a white face and ragged, clinging garments.

"Harry!" I whispered. I wonder yet that it was not a shout.

"Thank G.o.d!" came his voice, also in a whisper; and in another moment he had reached my side.

A hurried word or two--there was no time for more--and I pointed to the Incas on the raft, saying: "We want those spears."

"I was after them," he grinned. "What shall we do?"

"There's no use taking them while the Incas are away," I replied, "because they would soon return and find them gone. Surely we can handle two of them."

As I spoke there came a sound from the lake--a sudden loud splash followed by a commotion in the water. I looked around the corner of the boulder and saw that the spears again found their mark.

"Come," I whispered, and began to pick my way toward the ledge.

Harry followed close at my heels. It was easier here, and we soon found ourselves close to the sh.o.r.e of the lake, with a smooth stretch of rock between us and the fisherman's landing-place. The urns, whose light was quite sufficient here, were about fifty feet to the right and rear.

The Incas had made their kill and were paddling for the sh.o.r.e. As they came near, Harry and I sank back against the boulder, which extended to the boundary of the ledge. Soon the raft was beached and pulled well away from the water, and the fish--I was amazed at its size--followed.

They drew forth the spears and laid them on the ground, as they had done formerly; and, laying hold on the immense fish, still floundering ponderously about, began to drag it toward the mouth of the pa.s.sage.

"Now," whispered Harry, and as he stood close at my side I could feel his body draw together for the spring.

I laid a hand on his arm.

"Not yet. Others may be waiting for them in the pa.s.sage. Wait till they return."

In a few minutes they reappeared in the light of the flaming urns. I waited till they had advanced half-way to the water's edge, some thirty feet away. Then I whispered to Harry: "You for the left, me for the right," and released my hold on his arm, and the next instant we were bounding furiously across the ledge.

Taken by surprise, the Incas offered no resistance whatever. The momentum of our a.s.sault carried them to the ground; their heads struck the hard granite with fearful force and they lay stunned.

Harry, kneeling over them, looked up at me with a question in his eyes.

"The lake," said I, for it was no time for squeamishness.

Our friend the king thought us dead, and we wanted no witnesses that we had returned to life. We laid hold of the unconscious bodies, dragged them to the edge of the lake, and pushed them in. The shock of the cold water brought one of them to life, and he started to swim, and we--well, we did what had to be done.

We had our spears. I examined them curiously.

The head appeared to be of copper and the shaft was a long, thin rod of the same material. But when I tried it against a stone and saw its hardness I found that it was much less soft, and consequently more effective, than copper would have been. That those underground savages had succeeded in combining metals was incredible, but there was the evidence; and, besides, it may have been a trick of nature herself.

The point was some six inches long and very sharp. It was set on the shaft in a wedge, and bound with thin, tough strips of hide.

Altogether, a weapon not to be laughed at.

We carried the spears, the raft, and the oars behind a large boulder to the left of the ledge with considerable difficulty. The two latter not because we expected them to be of any service, but in order not to leave any trace of our presence, for if any searchers came and found nothing they could know nothing.

We expected them to arrive at any moment, and we waited for hours. We had about given up watching from our vantage point behind the boulder when two Incas appeared at the mouth of the pa.s.sage. But they brought only oil to fill the urns, and after performing this duty departed, without a glance at the lake or any exhibition of surprise at the absence of their fellows.

Every now and then there was a commotion in some part of the lake, and we could occasionally see a black, glistening body leap into the air and fall again into the water.

"I'm hungry," Harry announced suddenly. "I wonder if we couldn't turn the trick on that raft ourselves?"

The same thought had occurred to me, but Harry's impulsiveness had made me fearful of expressing it. I hesitated.

"We've got to do something," he continued.

I suggested that it might be best to wait another hour or two.

"And why? Now is as good a time as any. If we intend to find Desiree--"

"In the name of Heaven, how can we?" I interrupted.

"You don't mean to say you don't intend to try?" he exclaimed.

"Hal, I don't know. In the first place, it's impossible. And where could we take her and what could we do--in short, what's the use? Why the deuce should we prolong the thing any further?

"In the world I refused to struggle because nothing tempted me; in this infernal hole I have fought when there was nothing to fight for. If civilization held no prize worth an effort, why should I exert myself to preserve the life of a rat? Faugh! It's sickening! I wondered why I wanted those spears. Now I know. I have an idea I'm going to be coward enough to use one--or enough of a philosopher."

"Paul, that isn't like you."

"On the contrary, it is consistent with my whole life. I have never been overly keen about it. To end it in a hole like this--well, that isn't exactly what I expected; but it is all one--after. Understand me, Hal; I don't want to desert you; haven't I stuck? And I would still if there were the slightest possible chance. Where can we go?

What can we do?"

There was a long silence; then Harry's voice came calmly: