"Not a chance in the world. His rendezvous are always public places—the Pennsylvania or Grand Central Station, a movie theater, a hotel lobby, or the like. There he can put his back against the wall and make sure that no one is listening in. He's on to all the tricks of the trade and it will take a mighty clever man—or a bunch of them—to nail him."

"H-m-m!" mused the chief. "Well, at that, I believe I've got the man."

"Anyone I know?"

"Yes, I think you do—Morton Maxwell. Remember him? Worked on the Castleman diamond case here a couple of years ago for the customs people and was also responsible for uncovering the men behind the sugar-tax fraud. He isn't in the Service, but he's working for the Department of Justice, and I'm certain they'll turn him loose on this if I ask them to. Maxwell can get to the bottom of Weimar's business, if anyone can. Let me talk to Washington—"

And within an hour after the chief had hung up the receiver Morton Maxwell, better known as "Mort," was headed toward New York with instructions to report at Secret Service headquarters in that city.

Once there, the chief and Kenney went over the whole affair with him. Cottrell and Gary and the other men who had been engaged in shadowing the elusive Weimar were called in to tell their part of the story, and every card was laid upon the table.

When the conference concluded, sometime after midnight, the chief turned to Maxwell and inquired:

"Well, what's your idea about it?"

For a full minute Mort smoked on in silence and gazed off into space. Men who had just met him were apt to think this a pose, a play to the grand stand—but those who knew him best realized that Maxwell's alert mind was working fastest in such moments and that he much preferred not to make any decision until he had turned things over in his head.

"There's just one point which doesn't appear to have been covered," he replied. Then, as Kenney started to cut in, "No, Chief, I said appeared not to have been covered. Very possibly you have all the information on it and forgot to hand it out. Who does this Weimar live with?"