There was a moment's delay, so that I lifted my hand again, and then the door opened silently.

Within was like the black mouth of a cave, and I involuntarily took a step backward.
"This you, Craig ?" "Yes," I answered, half recognizing the cautious voice.
"All right then--come in.

There is nothing to fear, the floor is level." I stepped within, seeing nothing of the man, and the door was closed behind me.

The sharp click of the latch convinced me it was secured by a spring lock.
"Turn on the light," said the voice at my side sharply.

Instantly an electric bulb glowed dazzling overhead, and I blinked, about half blinded by the sudden change..