"Guess this is more than a one-man job," he thought to himself.
"What I'll have to do is to bring Bart and Billy here to-morrow
night, and I think the three of us can lift the door easily. I've
made one big step, anyway, for now I know there is really a trap
door here, and before we weren't sure of it."
He pressed the iron ring down into its socket, scattered some
earth and gravel over it, and at last satisfied that he had left
everything as he had found it and in such a condition as not to
arouse suspicion if the secret entrance was used by one of the
plotters before he could return, he turned his footsteps toward
camp.
CHAPTER XV
A BARE CHANCE
Frank was now convinced that he and his comrades had really
chanced on a big secret, and he was eager to get them and get to
the heart of the matter. He was greatly disappointed that he had
been unable to follow up the adventure that very evening, but with
a soldier's philosophy promised himself better luck the next time,
and swung off toward camp with a stride that soon brought him to
his destination.
But the Army Boy's plan for an immediate further investigation of
the mysterious alley was destined to have a further setback, for
the next day great aeroplane activity started all over the
American front, and it was announced that nobody would be given
leave to visit Coblenz until further notice.
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