He was not at home, however, and after waiting a long time I went away leaving word that I must see him the first thing in the morning on very urgent business.

I had walked a very little distance from the house when a man overtook me.

"Herr Bastable, I think?" he said.

"Yes. What do you want with me?"

"I have to request you to come with me. I am a police officer."

"Do you mean I am arrested? On what charge?"

"It is possible you will not be detained. It is in regard to Fräulein Korper. It is desired to put some questions to you. I can say no more."

It was of course useless to resist, so I turned and walked with him. We passed through several streets, and presently he stopped at the door of a house in a side street.

"This is not a police station," I objected.

"You are to be confronted with another prisoner under arrest here--Ephraim Ziegler--who is being detained here."