Mr. Grey and the chief exchanged glances. The chief shook his head. “It’s going to be dangerous,” remarked Mr. Grey.

“Any more dangerous than what we have already done?” asked Jack.

“There may be shooting. And you might get hurt.”

“I guess we could keep out of the way. We might keep in the background.”

“Well,” conceded Mr. Grey, “if the chief has no objections, I’ll get you into action somehow.” The chief shrugged his shoulders. “After all,” he commented, “who am I to deny them their fun?”

“That’s swell,” cried Jack.

Just then, Detective Spencer returned to the office and announced that everything was ready. “I’ll tell you what you can do first, boys. Suppose Paul and Ken and two officers go down to the grocery store at Jones Street and arrest Harriman, the grocery man. If he isn’t in the store, he is upstairs, in the first room on your right.”

“And what am I going to do?” asked Jack.

“You will come with me,” said the government man.

The boys rose. “Are we all ready?” asked the chief. “Because I’m also going along.”