But finding it open, I gave it just a little pull and found--well, it was a surprise, much more so than the sight of a skeleton would have been--that the whole interior was taken up by a small circular staircase such as you find in public libraries where the books are piled up in tiers. It stretched from the floor to the ceiling, and dark as it was I thought I detected the outlines of a trap-door by means of which communication was established with the room above. Anxious to be convinced of this, I consulted with myself as to what a detective would do in my place. The answer came readily enough: "Mount the stairs and feel for yourself whether there is a lock there." But my delicacy or--shall I acknowledge it for once?--an instinct of timidity seemed to restrain me, till a remembrance of Mr. Gryce's sarcastic look which I had seen honoring lesser occasions than these, came to nerve me, and I put foot on the stairs which had last been trod--by whom, shall I say? William? Let us hope by William, and William only. Being tall, I had to mount but a few steps before reaching the ceiling. Pausing for breath, the air being close and the stairs steep, I reached up and felt for the hinge or clasp I had every reason to expect to encounter. I found it almost immediately, and, satisfied now that nothing but a board separated me from the room above, I tried that board with my finger and was astonished to feel it yield. As this was a wholly unexpected discovery I drew back and asked myself if it would be wise to pursue it to the point of raising this door, and had hardly settled the question in my own mind, when the sound of a voice raised in a soothing murmur, revealed the fact that the room above was not empty, and that I would be committing a grave indiscretion in thus tampering with a means of entrance possibly under the very eye of the person speaking. If the voice I had heard had been all that had come to my ears, I might have ventured after a moment of hesitation to brave the displeasure of Miss Knollys by an attempt which would have at once satisfied me as to the correctness of the suspicions which were congealing my blood as I stood there, but another voice--the heavy and threatening voice of William--had broken into this murmur, and I knew that if I so much as awakened in him the least suspicion of my whereabouts, I would have to dread an anger that might not know where to stop.