At each new turn in the trail he fell behind some rock or clump of bushes and scanned the gorge as far as he could see ahead of him.

But each moment these distances of observation became shorter.

The ridge on his left became almost a sheer wall; on his right a second ridge closed in until the gorge had narrowed to a hundred feet in width, choked by huge masses of rock thrown there in some mighty upheaval of past ages.
It was very soon apparent to Rod that the mysterious person whom he was pursuing was perfectly at home in the lonely chasm.

As straight as a drawn whip-lash his trail led from one break in the rocky chaos to another.

Never did he err.