But just where? That's the question."
He pushed upon the stone above his head, but it refused to move.
Then he held up his torch and examined the ceiling carefully.
Whatever the method by which the stones could be moved, it was
carefully concealed.
Much chagrined, Billie at length decided to retrace his steps and
await the coming of his companions. He reached the landing and
crossed over to the steps by which he had descended.
Glancing up, he uttered an exclamation of surprise, for there at
the opening and peering down the stairs was Ambrosio, the ape.
With a cry of recognition the simian started to descend the
stairs, but at a noise from above he hesitated and then sprang
back and out of sight.
An instant later the opening was closed and Billie was left in
the darkness, except for the light of his torch.
CHAPTER XXIX.
THE MYSTERY DEEPENS.
While Billie was making his discoveries Donald and Adrian had
also been busy.
When they left the house, at Donald's suggestion, they went first
to the bank and told Don Esteban about the disappearance of the
box and what the maid had seen. He was much disappointed until it
was explained to him that they also had another clue.
"We shall spend our time in the slums," said Donald, "while our
chum keeps watch at the house.
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