"Here's his pocket-knife!" he cried, and held the article up.
"This proves that he came in here beyond a doubt."
"Yes; but where is he now?" put in Sam.
"They couldn't have spirited him away."
"He can't be far off," said Frank.
Again was the search renewed. The men had had one large room and one small apartment, where were located a dilapidated bed and a small writing table. On the table lay some writing material and several scraps of paper, but they were of no value.
The search through the rooms and hallways of the tenement lasted fully an hour. By this time the tenants who had gathered began to grow sleepy again, and one after another went back to their apartments.
"I don't think you are going to find anything," remarked Caleb Yates. "To my way of thinking, that boy must have followed the two men when they left."
"He couldn't do that without our seeing him," said Sam.
"And why not? Here's a back door, remember, and it's pretty dark outside."
"That may be so," returned Tom, shaking his curly head in perplexity. "It's too bad we didn't follow Girk and Baxter up—at least as far as the street."