Nat was nowhere to be seen.
"He has given us the slip."
"Is he up to some new trick?"
"Boys!" exclaimed Bob Somers, suddenly, "I'm going to leave you."
"Hold on I Where are you bound?"
"To the house behind the picket fence. It may be a waste of time—but—"
"Let us go along, too?" urged Sam.
Bob shook his head.
"Too risky, Sam."
"But I went the other day."