nless we are
careful. I shall stand behind this crate, and do you conceal yourselves
behind those. Then, when I flash a light upon them, close in swiftly.
If they fire, Watson, have no compunction about shooting them down."

I placed my revolver, cocked, upon the top of the wooden case behind
which I crouched. Holmes shot the slide across the front of his
lantern, and left us in pitch darkness--such an absolute darkness as I
have never before experienced. The smell of hot metal remained to
assure us that the light was still there, ready to flash out at a
moment's notice. To me, with my nerves worked up to a pitch of
expectancy, there was something depressing and subduing in the sudden
gloom, and in the cold, dank air of the vault.

"They have but one retreat," whispered Holmes. "That is back through
the house into Saxe-Coburg Square. I hope that you have done what I
asked you, Jones?"

"I have an inspector and two officers waiting at the front door."

"Then we have stopped all the holes. And now we must be silent and
wait."

What a time it seemed! From comparing notes afterwards it was but an
hour and a quarter, yet it appeared to me that the night must have
almost gone, and the dawn be breaking above us. My limbs were weary and
stiff, for I feared to change my position; yet my nerves were worked up
to the highest pitch of tension, and my hearing was so acute that I
could not only hear the gentle breathing of my companions, but I could
distinguish the deeper, heavier in-breath of the bulky Jones from the
thin, sighing note of the bank director. From my position I could look
over the case in the direction of the floor. Suddenly my eyes caught
the glint of a light.

At first it was but a lurid spark upon the stone pavement. Then it
lengthened out until it became a yellow line, and then, without any
warning or sound, a gash seemed to open and a hand appeared; a white,
almost womanly hand, which felt about in the center of the little area
of light. For a minute or more the hand, with its writhing fingers,
protruded out of the floor. Then it was withdrawn as suddenly as it
appeared, and all was dark again save the single lurid spark which
marked a chink between the stones.

Its disappearance, however, was but momentary. With a rending, tearing
sound, one of the broad, white stones turned over upon its side, and
left a square, gaping hole, through which streamed the light of a
lantern. Over the edge there peeped a cl