They
must be close to them now.
On they went, wonder gradually giving way to doubt, until with a
muttered exclamation Frank came plump up against the wall that
marked the alley's end.
"Stung!" he murmured in profound disgust.
His comrades gathered close about him.
"That's one on us," muttered Tom.
"We're done good and proper," agreed Billy.
"Are you dead sure that you saw them come in?" queried Bart of
Frank.
"I know I did," replied Frank, who although puzzled was not shaken
in his conviction.
"They must have been ghosts then," gibed Tom. "Nothing else could
have vanished through a brick wall."
Frank drew his flashlight from his pocket and flashed it about.
There was no one to be seen.
"That wall is perfectly blank," he murmured in perplexity. "Thirty
feet high if it's an inch. There isn't an opening in it anywhere."
"Could they have got into the windows of the building on either
side?" suggested Bart.
Frank swept the flashlight on the walls of the factories.
"Not a chance," he affirmed. "All these windows are protected with
iron bars and nothing could get between them.
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