"He must have come down here from the sitting-room," mused Denzil, as he stood in the cool, damp kitchen. "And--as the ribbon was found by Mrs. Kebby near yonder door--it is most probable that he left the kitchen by that passage for the cellar. Now it remains for me to find out how he made his exit from the cellar; and also I must look for the stiletto, which he possibly dropped in his flight, as he did the ribbon." While thus soliloquising, Denzil lighted a candle which he had taken the precaution to bring with him for the purpose of making his underground explorations. Having thus provided himself with means to dispel the darkness, he stepped into the door and descended the stone stairs which led to the cellars. At the foot of the steps he found himself in a passage running from the front to the back of the house, and forthwith turned to the right in order to reach the particular cellar, which was dug out in the manner of a cave under the back yard. This, as Lucian ascertained by walking round, was faced with stone and had bins on all four sides for the storage of wine. Overhead there was a glass skylight, of which the glass was so dusty and dirty that only a few rays of light could struggle into the murky depths below. But what particularly attracted the attention of Denzil was a short wooden ladder lying on the stone pavement, and which probably was used to reach the wine in the upper bins. "And I should not be surprised if it had been used for another purpose," murmured Lucian, glancing upward at the square aperture of the skylight. It struck him as possible that a stranger could enter thereby and descend by the ladder. To test the truth of this he reared the ladder in the middle of the cellar so that its top rung rested against the lower edge of the square overhead. Ascending carefully--for the ladder was by no means stout--he pushed the glass frame upward and found that it yielded easily to a moderate amount of strength. Climbing up, step after step, Lucian arose through the aperture like a genie out of the earth, and soon found that he could jump easily out of the cellar into the yard. "Good!" he exclaimed, much gratified by this discovery. "I now see how the assassin entered. No wonder the kitchen door was bolted and barred, and that no one was seen to visit Vrain by the front door. Any one who knew the position of that skylight could obtain admission easily, at any hour, by descending the ladder and passing through cellar and kitchen to the upper part of the house. So much is clear, but I must next discover how those who entered got into this yard."