The leader might have joined his men only now.
"I don't know anything about the papers," insisted Fremont.
"Huh!" muttered Jimmie, from his hiding place.

"Why don't he tell his nobbs who he is?
Then he might be released." Jimmie did not know that Fremont had long been considering this very point, and finally decided that the correct course for him to pursue would be to permit his captor to remain in ignorance of his identity.
The instant he knew that his brigands had made a mistake, the fellow would be out after Nestor with a larger force, and that would make it dangerous for the boy, would hamper him in the work he was there to do.
Besides, he believed that the course he proposed would gain time, and that Nestor would certainly come to his rescue.
"You are making a mistake," the big man threatened, as Fremont again denied knowledge of the papers.

"You are known to have been in the Cameron building that night.

You are known to have taken the papers away from there, and to have made use of them.

I won't say what treacherous use now.