"And so," he remarked simply, as after a moment's waiting we made sure that the machine had stopped talking, "it appears that our friends, the enemy, are watching us as closely as we are watching them—with the advantage that they know us and we don't know them, except this garage fellow."

Garrick lapsed into silence. I was rapidly turning over in my mind what we had just overheard and trying to plan some way of checkmating their next move.

"Here's a plot hatching to rob Warrington's safe," I exclaimed helplessly.

"Yes," repeated Garrick slowly, "and if we are going to do anything about it, it must be done immediately, before we arouse suspicion and scare them off. Did you hear those footsteps over the detectaphone? That was the Boss going out of the garage. So, they expect me around there, nosing about Warrington's apartment. Well, if I do go there, and then ostentatiously go away again, that will lure them on."

He reached his decision quickly. Grabbing his hat, he led the way out of the Old Tavern and up the street until we came to a drug store with a telephone.

I heard him first talking with Warrington, getting from him the combination of the safe, over long distance. Then he called up his office and asked the boy to meet him at the Grand Central subway station with a package, the location of which he described minutely.

"We'll beat them to it," he remarked joyously, as we started leisurely uptown to meet the boy.

Chapter XIII

THE INCENDIARY

"The Warrington estate owns another large apartment house, besides the one where Warrington has his quarters, on the next street," remarked Garrick, half an hour later, after we had met the boy from his office. "I have arranged that we can get in there and use one of the empty suites."