Carton silently pulled down and locked the top of his desk, then for a moment we debated where we should dine.  We decided on a quiet hotel uptown and, leaving word where we could be found, hurried along for the first real relaxation and refreshment after a crowded day’s work.

If, however, we thought we could escape even for a few minutes we were mightily mistaken.  We had not fairly done justice to the roast when a boy in buttons came down the line of tables.

“Mr. Carton—­please.”

The District Attorney crooked his finger at the page.

“You’re wanted at the telephone, sir.”

Carton rose and excused himself.

The message must have given him food of another kind, for when he returned after a long absence, he pushed aside the now cold roast and joined us in the coffee and cigars.

“One of my men,” he announced, “has been doing some shadowing for me.  Evidently, both Murtha and Kahn having failed, they are resorting to other tactics.  It looks as if they had in some way, probably from some corrupt official of the court or employee in charge of the jury list, obtained a copy of the panel which Justice Pomeroy has summoned for the case.”

“It ought to be a simple thing to empanel another set of talesmen and let these fellows serve in some other part of the court,” I suggested, considering the matter hastily.

“Much better to let it rest as it is,” cut in Craig quickly, “and try to catch Kahn with the goods.  It would be great to catch one of these clever fellows trying to ‘fix’ the jury, as well as intimidate witnesses, as he already hinted himself.”

“Just the thing,” exclaimed Carton, whose keen sense of proportion showed what a valuable political asset such a coup would make in addition to its effect on the case.

“We’ll get Kahn right, if we have a chance,” planned Craig.  “You are acquainted more or less with his habits, I suppose.  Where does Kahn hang out?  Most fellows like him have a sort of Amen Corner where they meet their henchmen, issue orders, receive reports and carry on business that wouldn’t do for an office downtown.”

“Why, I believe he goes to Farrell’s—­has an interest in the place, I think.”

Farrell’s, we recognized, as a rather well-known all-night cafe which managed to survive the excise vicissitudes by dint of having no cabaret or entertainment.

We finished the dinner in silence, Kennedy turning various schemes over in his mind, and rejecting them one after another.

“There’s nothing we can do immediately, I suppose,” he remarked at length.  “But if you and Carton care to come up to the laboratory with me, I might in time of peace prepare for war.  I have a little apparatus up there which I think may fit in somehow and if it does, Mr. Kahn’s days of jury fixing are numbered.”

A few minutes later, we found ourselves in Kennedy’s laboratory, where he had gathered together an amazing collection of paraphernalia in the warfare of science against crime which he had been waging during the years that I had known him.