"That was different. Can't wait to talk, fellows—see you later."
"Perhaps Nat has gone to meet his uncle and their mysterious friend," thought the boy. "I wish I could get a good look at that fellow's face."
At the next corner, he jumped on board a car, rode for some distance, then transferred to another line. When he got off, although still at some distance from his destination, he began to keep a sharp lookout for Nat.
"The Trailer trailed," he chuckled; "Nat isn't quite so smart as he thinks he is."
Bob scarcely breathed easily until he was back of the bushes which had helped to conceal him on the day before. A number of people were near, and he found it difficult to avoid observation.
The minutes seemed to slip by very slowly. The sun grew hotter and hotter, and Bob, wiping his perspiring face, began to think that his vigil would result in nothing.
"Whew, but it is warm!" he murmured. "I can't stand this much longer. Don't see a sign of life now. By Jingo! that isn't a bad idea."
A sudden thought had entered his head.
"It's pretty risky," he muttered; "but I'll do it. I haven't come all this way for nothing."
Bob took a careful view of the deserted street, then arose and walked boldly toward the house.