Again, as I spoke, I felt the pleasurable thrill of adventure which I had supposed had gone with my youth. "You want me to wait here till you signal?" he asked. "Yes." "As you say!" he agreed. "The old servant knows. She must tell. I can't stand it any longer. She must be made to tell." I nodded. He indicated the proper key with a touch of his forefinger. Whereupon, crossing the sidewalk again and ascending the Estabrooks' steps with as much unconcern as if they had been my own, I fitted the key softly and turned the lock. The very instant that I tried to open the heavy door, however, I knew that a watcher who had been observing our movements through the silk curtains was behind it. I felt a resisting pressure. I heard a stifled scream. It was no moment for indecision. With an unbelievable rapidity of thought, I estimated the chances of the unseen person being armed, the hazard of his giving vent to an uproar which would bring the neighborhood about our ears. Then I threw my body against the door with all the force I could muster. It yielded suddenly; with a crash it flew back against the tiled wall. I was precipitated forward and a second later found myself in the ridiculous performance of rolling around on the floor with what felt to me like a fat wash, consigned to a laundry. It was, however, a bundle from which choking imprecations and grunts exploded, and which for a turn or two was enlivened with upheavals of some strength. Well enough to laugh now, but at that moment, you may be sure, I was searching with my free hand for the person's mouth. I had meant to be gentle: if I clapped my hand over the source of the little cries and protests, when I had found it, with something more than decision, you must blame the circumstances. I had expected to surprise old Margaret from behind and give her such a whiff of cataleptol that she would have suffered no inconvenience. Unfortunately I had not at first known that it was she whom I had encountered, and now there were obvious difficulties in the way of my applying my saturated gauze to her nose. "Be still!" I commanded, trying to uncork my vial, with a single hand. "Be still. No harm will come to you." Her reply was a well-placed thrust of her two old knees which nearly sent me through the glass. It placed me in a position, however, where I could, with a push of my foot, close the door and shut us into the vestibule, so that her clamor, which had broken forth again, might be muffled.