an eye on this boy."

"And also on that man," added Hal, pointing to the book-keeper.

Mr. Sumner was in deep perplexity. He ran his hand through his hair.

"Let us talk this matter over first," he said. "You say, Hardwick, you
left Carson alone in the office yesterday afternoon?"

"Yes, sir."

"How long?"

"Not more than ten minutes."

"When was this?"

"A few minutes after you and Mr. Allen went out."

"When you came back what was Carson doing?"

"He was at the desk, pretending to write."

"Was there anybody else here?"

"By Jove! yes," exclaimed Hardwick, suddenly.

"Ah! who?"

"I don't know, sir."

"A man?"

"Yes. Rather a common-looking fellow, about thirty-five years of age."

"What did he want?"

"He asked for Mr. Allen, and when I said he wouldn't be back during the
rest of the day he went off."

Mr. Sumner turned to Hal. The youth stood staring at the wall.

"What have you to say about this stranger?"

"He came in directly after Mr. Hardwick went out," returned the youth.

"What was his business?"

"He wished to see Mr. Allen."

"Did he go back to the safe?"

"I--I don't think so."

"You are not sure?"

"Not positive, sir. I was busy writing, and did not notice him closely."

"Did the man give any name?"

"No, sir."

"I suppose you didn't know him?"

Hal shook his head. He was beginning to believe he had made a big
mistake by not watching the stranger during the time he was in the
office back of the railing.

"I believe I saw the man wink at this boy as he went out," put in
Hardwick. "I am pretty certain the two knew each other."

"That is not true," burst out Hal.

For some reason, this insinuation made him think more than ever that the
book-keeper was guilty.

"Which way did the man go?" went on the elderly broker.

"Toward Broadway," replied Hal.

"Did he have anything under his arm?"

"He had a small bundle, but he had that when he came in."

"About how large?"

Hal illustrated with his hands.

"Probably that was an empty box, or something of that sort," ventured
Mr. Allen. "He placed the tin box into it."

"Quite likely," returned Mr. Sumner.

"And the only question in my mind," went on his partner, "is whether or
not this boy here was in with the fellow. If you will take my advice,
Sumner, you will have him arrested without delay."

CHAPTER V.

HAL DETERMINES TO ACT.

As Mr. Allen spoke he caught Hal by the shoulder.

"You had bette