Frank eyed the other with a grin, but made no reply for a time, then he merely said:
"You are up to your old tricks! Well, what is on for to-night?"
"Why," Ned answered, "if you would like a stroll by moonlight, I think we might get a good view of the south country from the top of the mountain."
"I don't know what you're up to," Frank answered, springing to his feet, "but I'm game for anything. I've been eating my heart out all day."
"What about the prints?" asked Ned.
"They are remarkably good," Frank replied, "but there are no special features. In one picture, taken down in the canyon, there is a face that we did not see, though."
"What sort of a face?"
"A strange one to me. But I'll show them all to you in the morning.
When are you going out for that stroll in the moonlight?"
"In two hours. That will be about midnight. Between now and that time
I'm going to get a little sleep. Wake me at twelve, will you—and, by
the way, say nothing to the others about it. They'll all want to go!
We can notify whoever is on watch when we get ready to start."
Ned hastened to his bunk and lay down. Five minutes later, when Frank looked in, he was studying a French dictionary by the light of his electric candle. Ten minutes later he was sound asleep. At twelve the boys were ready to start, and Teddy, who was on watch, was warned to keep wide awake and listen for noises from the south.