“With you on that,” came from Joe quickly.
“It will take us many days to get to Pasaje,” Dr. Rander put in. He intended to go with the youths to that town, where he wished to remain for several days.
“Wonder if we’ll see anything more of interest?” Joe was anxious to observe all that was worthwhile.
“There are other secrets I will show you,” explained Dr. Rander. “But as far as I know there is no more treasure.”
They decided to rest the remainder of that day, for all were tired from the strain. On a little shelf beside the roaring Apurimac they made camp.
“Now lead us to more secrets,” said Bob the next morning, when they were ready to resume the journey.
“I will,” returned the old man.
He kept his promise. Late that afternoon they had been following a narrow trail that curved with the river when Dr. Rander stopped and pointed up to a tall peak.
“Beyond that is a little hidden valley,” he told the youths. “In it is a tall tower that was built by the Incas. As far as I know, I am the only person who has ever found it.”