One thing was certain, however, and that was that there had been no such odour in the tent when he went to sleep; and it must therefore have been brought in by somebody since then. Now, nobody but himself had any business there, unless it were Ling come to wake him. But Ling would, or should, have stood at the entrance and called him; or at the most, if calling had not aroused him, have come boldly in and shaken him.

There was no sound, however, in the tent, and therefore the intruder, if there were one, had no legitimate business there; and the more Frobisher thought about the matter, the more certain he became that all was not as it should be.

He therefore very slowly and very silently divested himself of his blankets, leaving them in a bundle on the ground, and, with the revolver still grasped tightly in his hand, started to crawl noiselessly toward the open flap of the tent, which he located by seeing the glimmer of stars shining through. At the same time he took care to keep close to the side of the tent walls, so as to avoid, if possible, colliding with his supposed unknown visitor.

The odour was much more pungent now, and Frobisher knew that in a few seconds he would recognise it for what it was. Surely, he thought, there was a suggestion of oiliness about it, and—then in a moment he knew. The strange perfume was that of sandalwood oil, and he instantly realised what the circumstance meant. There was a human being in the tent, somebody who had planned murder, or robbery, or both; and the man had oiled himself so that, if his intended victim happened to be awake and grappled with him, he would be able to twist himself loose and escape.

Frobisher was by no means easily flurried, but when he realised that he was alone in a dark tent with a desperate man seeking his life; that he was possibly within arm’s-reach of the fellow at that moment; and that in another second he might feel a long, keen blade sliding in between his ribs, it was only with difficulty that he restrained himself from firing off all six chambers of his revolver into the darkness, in the hope that one of the bullets might find its billet.

And then, at the very moment when he felt that his nerves would bear the strain no longer, the spell was broken. Suddenly there came a long, hissing breath close beside him, and immediately afterward a terrific thud, as something—Frobisher could easily guess what—was driven with deadly force into the heap of blankets close beside him.

With a tremendous bound the young Englishman leaped forward, dropping his revolver as he did so, and grappled with the intruder; but the man had been prepared for any mishap by oiling his body, and twisted and squirmed like an eel. So slippery was his skin that Frobisher, with all his tremendous strength, recognised that he could not hold him. He therefore gripped the fellow’s wrist as firmly as he could with his left hand, and drew back his clenched right fist for a knock-out blow. But before he could deliver it he received a fearful kick in the stomach from one of the man’s feet—which luckily were bare, or he would have been killed—and he doubled up like a jack-knife, involuntarily loosening his grip on the other’s wrist. In an instant the man had gained the door of the tent, and was lost in the darkness, while poor Frobisher lay upon the ground gasping.

It was fully ten minutes before he had so far recovered as to be able to stand upright; but as soon as his strength returned he struck a match and lighted a lantern. By its light he examined the pile of blankets which had formed his bed, and, as he expected, found them pinned to the ground by a long, wavy-bladed knife, very similar in appearance to a Malay kris, which had been driven into the earth up to the very hilt by a blow that would assuredly have killed him, had he continued to slumber for another five minutes.

Frobisher drew out the knife, and tried to remember whether he had ever seen it before—whether he had observed it in the possession of any of the men composing the caravan; but he could not remember having seen a knife of the kind in the hands of any of the drivers. He therefore threw it aside, and cautiously opened the flap of the tent to see whether there was any mischief going on outside. But all was silent, and he could see some of the shadowy forms of the men on guard.

It was then half-past eleven, as he found by looking at his watch, and too late to go to sleep again, even if he felt inclined.