"What shall we do?" she asked, her lips at Cavendish's ear. "We cannot pass them—they are on guard."

"I was wondering how close I could creep in before they saw me," he answered, using the same caution. "If I was only sure they were alone, and could once get the drop, we might make it."

"You fear there may be others posted at the top?"

"There is quite likely to be; the fellows are evidently taking no chances of surprise. What do you think best?"

"Even if you succeeded in overawing these two, we would have no way of securing them. An alarm would be given before we could get beyond reach. Our only hope of escape lies in getting out of here unseen."

"Yes, and before Cateras is discovered."

"He gave no orders to the guard to return?"

"No; but he will be missed after a while and sought for. We cannot count on any long delay, and when it is found that he has been knocked out, and we have disappeared, every inch of this cave will be searched. There is no place to hide, and only the two ways by which to get out."

"Then, let's go back and try the other," she urged. "That opens directly into the valley and is probably not guarded. What is happening now?"

A grey gleam of light struck the steps from above, recognised instantly as a reflection of day, as though some cover had been uplifted connecting this underground labyrinth with the clear sky. A dim shadow touched the illumined rocks for a brief moment, a moving shadow uncertain in its outlines, grotesque, shapeless: and then the daylight vanished as suddenly as it dawned. There was a faint click, as though a door closed, while darkness resumed sway, the silence unbroken, but for the scraping of a step on those rude stairs. The two guards below came to their feet, rigid in the glow of the lantern, their faces turned upward. Then a man came slowly down the last few steps and joined them.