Outside, Jack recognized the figure half a block down the street. He led the way in pursuit, Frank a few paces behind.

If the man, fearing he was followed, was trying to shake off possible pursuers, he could not have gone about it in a manner more to have aroused Jack’s suspicions.

First he crossed the street and then turned to the left down a side street. At the next corner he again turned to the left, walked two blocks ahead, and again turned to the left.

“Whoever he is, he’s up to something with all this maneuvering,” said Frank.

Jack nodded.

“I’ll bet I’m right,” he declared.

Again the man ahead turned a corner, this time, however, to the right. Jack and Frank came around the corner a moment later and the former uttered an exclamation of dismay. The man they had been trailing was nowhere to be seen.

“Now where do you suppose he has gone?” demanded Jack in deep disgust.

“Not knowing, I can’t say,” said Frank. “But it wouldn’t be much of a guess to say that he disappeared in one of these houses. Which one, I haven’t any idea.”

“I suppose you’re right,” said Jack. “I wonder if he suspected he was being followed?”