I had already risen to my feet and had hastened to his side.

"I think it would be better that we should be going, Doctor Nikola," I said, turning to our host.

The Spaniard, on his side, did not utter a word. He was so dazed as to be beyond the power of speech. But Nikola did not seem to comprehend what I said. Never before had I seen such a look upon his face. His complexion was always white, now, however, it was scarcely human. For my own part I knew what was passing in his mind, but I could give no utterance to it.

"Come," I said to my companions, "let us return to our hotel."

They rose and began to move mechanically towards the door. The Duke had scarcely reached it, however, before Nikola, with what I could see was a violent effort, recovered his self-possession.

"You must forgive me," he said in almost his usual voice. "I had for the moment forgotten my duties as host. I fear you have had but a poor evening."

When we had donned our hats and cloaks, we accompanied him down-stairs through the house, which was now as silent as the grave, to the great doors upon the steps. Having hailed a gondola we entered it, after wishing Nikola "good-night." He shook hands with Glenbarth and myself, but I noticed that he did not offer to do so with the Don. Then we shot out into the middle of the canal and had presently turned the corner and were making our way towards our hotel. I am perfectly certain that during the journey not one of us spoke. The events of the evening had proved too much for us, and conversation was impossible. We bade Martinos "good-night" in the hall, and then the Duke and I ascended to our own apartments. Spirits had been placed upon the table, and I noticed that the Duke helped himself to almost twice his usual quantity. He looked as if he needed it.

"My God, Dick," he said, "did you see what happened in that room? Did you see that woman kneeling with the——"

He put down his glass hurriedly and walked to the window. I could sympathize with him, for had I not seen the same thing myself?

"It's certain, Dick," he said, when he returned a few moments later, "that, were I to see much more of Nikola in that house, I should go mad. But why did he let me see it? Why? Why? For Heaven's sake answer me."