The light showed a large kitchen, with torn wall-paper and decorator's litter strewn about the floor, a whitewash pail in one corner, and nothing else. I climbed in, and, taking from my pocket the Browning pistol without which I had never traveled since the return of the dreadful Chinaman to England, I crossed to the door, which was ajar, and looked out into the passage beyond. Stifling an exclamation, I fell back a step. Two gleaming eyes stared straightly into mine! The next moment I had forced a laugh to my lips ... as the marmoset turned and went gamboling up the stairs. The house was profoundly silent. I crossed the passage and followed the creature, which now was proceeding, I thought, with more of a set purpose. Out into a spacious and deserted hallway it led me, where my cautious footsteps echoed eerily, and ghostly faces seemed to peer down upon me from the galleries above. I should have liked to have unbarred the street door, in order to have opened a safe line of retreat in the event of its being required, but the marmoset suddenly sprang up the main stairway at a great speed, and went racing around the gallery overhead toward the front of the house. Determined, if possible, to keep the creature in view, I started in pursuit. Up the uncarpeted stairs I went, and, from the rail of the landing, looked down into the blackness of the hallway apprehensively. Nothing stirred below. The marmoset had disappeared between the half-opened leaves of a large folding door. Casting the beam of light ahead of me I followed. I found myself in a long, lofty apartment, evidently a drawing-room. Of the quarry I could detect no sign; but the only other door of the room was closed; therefore, since the creature had entered, it must, I argued, undoubtedly be concealed somewhere in the apartment. Flashing the light about to right and left, I presently perceived that a conservatory (no doubt facing on the square) ran parallel with one side of the room. French windows gave access to either end of it; and it was through one of these, which was slightly open, that the questioning ray had intruded. I stepped into the conservatory. Linen blinds covered the windows, but a faint light from outside found access to the bare, tiled apartment. Ten paces on my right, from an aperture once closed by a square wooden panel that now lay upon the floor, the marmoset was grimacing at me. Realizing that the ray of my lamp must be visible through the blinds from outside, I extinguished it ... and, a moving silhouette against a faintly luminous square, I could clearly distinguish the marmoset watching me. There was a light in the room beyond!