I'm going to get to the bottom of that
mystery or know the reason why."
"All right. I'm with you."
By the time they had reached the alley it was almost entirely
dark. Choosing a moment when the street was empty, they slipped
into the alley and made their way toward the further end.
They felt the walls on either side as they went along for
indications of a door or opening of any kind. They did the same
with the blank wall that closed the alley at the other end.
Nothing rewarded their search. The wall at the farther end was far
too high to scale. It seemed impossible for anything except with
wings to vanish from the alley as completely as had their
assailants on that memorable night when they had so nearly lost
their lives.
"It beats me," said Bart at length. "We saw them go in and we
followed them up and they weren't there. Sounds like black magic,
doesn't it?"
"It surely does," agreed Frank, in great perplexity. "They didn't
go through the back, they couldn't go through the sides, they
couldn't go into the air, but they did go somewhere."
"Down into the ground," suggested Bart jokingly.
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