"We might be able to sneak up closer when they're asleep."
"We'll try it. The only thing for us to do right now is wait until they're all asleep."
The boys settled themselves down in the bushes, prepared for a vigil until nightfall. It was now late in the afternoon, and when Frank glanced up at the sky he saw that clouds had gathered. The sunshine had gone, for a dense black cloud obscured the sun. The sultry and oppressive heat of the afternoon had evidently presaged a storm.
"Looks like rain."
"It sure does," agreed Joe, looking up.
As though in corroboration, there was an ominous rumble of thunder. The wind had died down. Every leaf, every blade of grass was still. The clouds were massing silently.
However, the storm held off, and although the sky was overcast and threatening, twilight fell without rain. Frank and Joe, from their hiding place in the bushes, watched the four men moving aimlessly about the cave that afternoon. Two of them had remained inside the cave for a long time while the other pair chatted on the rocks outside.
Night came at last. From the interior of the cave came the flicker of flames, and the Hardy boys knew that the gang was making a fire for the night.
