immediately in the rear.

Still keeping in the shadows, we circled the camp till we were in front
of the stone table, but just when I took a step into the moonlight space
before it, Holman grasped my arm and drew me back.

"Look!" he gurgled. "Look! there he is again!"

All doubts concerning the youngster's previous observations were swept
away at that moment. A head and shoulders rose suddenly above the black
line of the immense flat stone, remained there for the space of three
minutes, then dropped back so that we could not see it from the position
in which we stood.

"Take the two front pillars!" whispered Holman. "I'll watch the two back
ones. Come on!"

We dashed across the open space, the youngster rushing to the rear,
while I ran to the front columns. It was impossible for any one to
descend unless we saw him, and with nerves on a tension we walked around
the huge supports and watched anxiously for the midnight watcher to
descend.

We must have remained on guard for twenty minutes or more, but there was
no sign of the spy. Around us the massive structure cast a patch of
velvety shadow, but not the slightest sound came from above.

Holman tired of the inactivity, and stepped across to where I was
standing. "I'm going to climb that chestnut tree and see if the beggar
is still there," he murmured. "You stop here till I take an