In an instant Durham read the significance of it. The horse had crossed the gully on to level ground and, urged by its rider, had cantered out of hearing. Exactly such a thing would happen were the gully he had crossed the one which came out on to the level sandy margin of the pool.

The realisation sent a chill through him. The rise up which he was climbing must be the ridge which formed the bluff above the cave. If he were not over it quickly, the Rider would be the first at the cave and Durham's scheme for his capture defeated.

The thought drove the last vestige of dizziness from his brain. He faced the slope and forced his way through the tangled undergrowth until he came to the top and saw the moonlight gleaming on the surface of the pool and illuminating with its silvery sheen the open space at the foot.

There was no sign of the horse he expected to see, and no sound came from the cave. With his carbine ready, he crept slowly and silently down until he was at the mouth. A stray moonbeam fell upon the spot where he had seen the clothes on his former visit. The spot was bare.

He was about to step into the cavern when he heard the distant tread of the horse. Quickly drawing back, he hid himself behind a clump of shrubs which sheltered him, while leaving him a clear view in front up to the line of bushes stretching from the bank to the water's edge. There he waited, while the sound of the horse approaching became more and more distinct.

Presently it was so clear he could hear the snapping of the twigs of the undergrowth as they were trampled down, and he levelled his carbine so as to cover the man immediately he and his horse emerged from the line of bushes. But when the animal appeared, for the moment Durham thought it was riderless. Only when it reached the middle of the open space and was almost directly below him did he see the man, lying forward over the withers, with his arms weakly clinging to the horse's neck and his legs swaying limply as they dangled with the feet out of the stirrups.

Of its own accord the horse stopped. The man painfully pushed himself up until he was able to turn his head and look from side to side.

He was scarcely ten yards from Durham, and the clear light of the moon revealed the face as distinctly as though it were day. The close-cropped hair, fair almost to whiteness, the eyebrows and eyelashes of the same hue; the general form of the face showing above the beard were incongruously, yet elusively, familiar, while the pallor of the cheeks and the anguish of the eyes told of the terrible injury the man had sustained.

He was trying to push himself up so as to sit in the saddle. Only his arms seemed to have any strength, for the legs still dangled limply and the fingers clutched the horse's mane convulsively as the body swayed. The moonlight fell full upon the face, glistening on the beads of moisture which stood out on the skin.

A twinge of pity passed through Durham's heart as he watched the agony of the stricken wretch. The effort to maintain his balance was more than the weakened muscles could stand. A deep groan broke from his lips as his arms gave way; his head fell and he plunged forward, slipping over the horse's shoulder and coming head first to the ground, where he lay in a limp, dishevelled heap.