There was a tingle of novelty even in standing before a grimly substantial and altogether forbidding-looking house, and being conscious of the fact that you had decided on its secret invasion. I could no longer deny that it took a certain crude form of nerve. I was convinced of this, indeed, as I saw the approaching figure of a patrolman on his rounds. It caused me, as I felt the jimmy like a staybone against my ribs, and the flashlight like a torpedo-head in my pocket, to swing promptly about into Twelfth Street and walk toward Sixth Avenue. I experienced a distinct glow of satisfaction as the patrolling footsteps passed northward up the quietness of the avenue. But the house itself seemed as impregnable as a fortress. It disheartened me a little to find that not even a basement grill had been disturbed. For the second time I turned and sauntered slowly toward Sixth Avenue. As I swung eastward again I found that the last house on the side-street, the house abutting the Fifth Avenue mansion which was the object of my attack, was vacant. Of that there could be no doubt. Its doors and windows were sealed with neatly painted shutters. This, it occurred to me, might mark a possible line of approach. But here again I faced what seemed an impregnable position. I was backing away a little, studying that boarded and coffin-like front, when my heel grated against the iron covering of a coal-chute. This coal-chute stood midway between the curb and the area railing. I looked down at it for a moment or two. Then something prompted me to test its edge with the toe of my shoe. Then, making quite sure that the street was empty, I stooped down and clutched at the edge of the iron disk. It was quite heavy. But one tug at it showed me that its lock-chain had been forced apart. It took but a moment to lift the metal shield to one side of the chute-head. It took but another moment to lower myself into the chute itself. I could see that it was a somewhat ignominious beginning. But I felt buoyantly sure that I was on the right track. It took an effort to work the iron disk back over the opening. It also required many strange contortions of the body to worm my way down into that narrow and dirty tunnel. My rather peremptory advent into the coal-bin resulted in a startling amount of noise, noise enough to wake the soundest of sleepers. So I crouched there for several seconds, inhaling dust, and listening and wondering whether or not the walls above me harbored a caretaker. Then I took out the pocket searchlight, and, with the pressure of a finger, directed my ray of illumination against a wooden partition bisected by a painted wooden door.