We could hear shots, above us.

"They may need us," cried Elaine, impatiently.

It was impossible to ride up the sheer height above.

"Dismount," ordered Captain Price.

His men jumped down and we followed him. Elaine struggled up, now helped by me, now helping me.

Further down the hill from the deserted house which we could see above us at the top was an underground passage which had been built to divert part of the water above the falls for power. Through it the water surged and over this boiling stream ran a board walk, the length of the tunnel.

Into this tunnel we could see that a masked man had made his way. As he did so, he turned for just a moment and fired a volley of shots.

Elaine screamed. There were Arnold and Woodward, his targets, coming on boldly, as yet unhit. They rushed in after him, in spite of his running fire, returning his shots and darting toward the tunnel entrance through which he still blazed back at them.

From our end of the ravine, we could see precisely what was going on. "Come—the other end of the tunnel," shouted Price, who had evidently been over the ground and knew it.

We made our way quickly to it and it seemed as if we had our man trapped, like a rat in a hole.