Occasionally, at intervals, the rifles cracked. Except for that no
other sound came to him. He could keep no count of time. It seemed to
him that hours slipped away. In reality it could have been only a few
minutes.

Below, from the foot of the winding stairway, there was a sound, such
a one as might come from the grinding of loose rubble beneath the sole
of a boot. Presently the man on the ledge heard it again, this time
more distinctly. Some one was crawling up the rocks.

Tom peered into the darkness intently. He could see nothing except the
flat rocks disappearing vaguely in the gloom. Nor could he hear again
the crunch of a footstep on disintegrated sandstone. His nerves grew
taut. Could he have made a mistake? Was there another way up from
behind?

Then, at the turn of the stairway, a few feet below him, a figure rose
in silhouette. It appeared with extraordinary caution, first a head,
then the barrel of a rifle, finally a crouched body followed by bowed
legs. On hands and knees it crept forward, hitching the weapon along
beside it. Exactly opposite Morse, under the very shadow of the
sloping ledge on which he lay, the figure rose and straightened.

The man stood there for a second, making up his mind to move on. He
was one of the half-breeds West had brought with him. Almost into his
ear came a stern whisper.

"Hands up! I've got you covered. Don't move. Don't say a word."

Two arms shot skyward. In the fingers of one hand a rifle was