I had just finished my pipe and knocked out the ashes on the heel of my boot, when the carriage slowed down and entered a covered way⁠—as I could tell by the hollow echoes. Then I distinguished the clang of heavy wooden gates closed behind me, and a moment or two later the carriage door was unlocked and opened. I stepped out blinking into a covered passage paved with cobbles and apparently leading down to a mews; but it was all in darkness, and I had no time to make any detailed observations, as the carriage had drawn up opposite a side door which was open and in which stood a woman holding a lighted candle.

“Is that the doctor?” she asked, speaking with a rather pronounced German accent and shading the candle with her hand as she peered at me.

I answered in the affirmative, and she then exclaimed:

“I am glad you have come. Mr. Weiss will be so relieved. Come in, please.”