“No, no. I came through here once before, and I remember Mr Upward saying it would take a whole day to cross over the mountain. The tangi is only about a mile long.”

“That means twenty minutes riding slow. Come along. We shall soon do it.”

But, even as his tone was, an ugly picture came before the speaker’s mind—that of a rush of black water many feet high, syphoned between those smooth walls. Anxiously but furtively his glance scanned them as they rode along.

As the narrowness of the passage wound and widened a little, the sky once more became visible overhead. The sky? But it had clouded over, and the rain fell somewhat smartly now upon the two wayfarers. A blue gleam of lightning shot down into the depths, and the reverberating peal which followed was as though telephoned in menacing boom through this tube-like chasm. Hundreds and hundreds of feet they towered up now, those iron-bound walls. It was like penetrating deeper and deeper into the black heart of the mountain.

“See that place up there?” said Nesta, pointing to a kind of slanting ledge quite twenty feet above and which might be reached by a strong climber, though even then with difficulty. “Last time we came through here, Bhallu Khan told us that two men had been overtaken by a rush, and succeeded in getting to that point; but even there the water had reached one of them and swept him away. Horrible, isn’t it?”

“Very likely he invented the whole thing. He has an excellent imagination, has our friend Bhallu Khan.”

This he said to reassure her, not that he thought the incident improbable. Indeed, glancing up at the spot indicated, he saw that evidence in the shape of sticks and straws was not wanting to show that the water had at some time reached that altitude, and the idea was not pleasant. In the vivid sunshine of a cloudless day it would have added interest to their way; now, with a gathering storm breaking over their heads, and another half mile of what might at any moment become a raging death-trap before them, it was dismal.

Another turn of the chasm, and the way, which had hitherto been level and pebbly, now led up over steep and slippery slabs. It became necessary to dismount, and here—Nesta’s pony which she was leading, for it became necessary to adopt single file, slipped and fell badly on its side. By the time the terrified beast was on its legs again, shivering and snorting, and sufficiently soothed down to resume the way, some precious minutes had been lost.

“We might mount again now,” said Campian, noting that the way was smoother. “Come. Jump up.”

But instead of placing her foot in the hand held ready to receive it, the girl stood as though turned to stone. Every drop of blood had forsaken her face, which was now white as that of a marble statue, her lips ashy and quivering.