“There is somebody with her, somebody was listening at the door. I have a feeling as if I was being watched. And yet—I examined the door, but there is no crack anywhere and the key is in the lock. Still I seem to feel a burning glance resting on me. Ah! the parrot! is this another delusion? Oh God, let it end soon! I am not yet quite insane, but all these unknown dangers around me will drive me mad. I must fight against them.

“Thursday. They brought me back my travelling bag. My attendant is uneasy. She was longer in cleaning up the room than usual to-day. She seemed to want to say something to me, and yet she did not dare to speak. Is something to happen to-day then? I did not close my eyes all night. Can one be made insane from a distance? hypnotised into it, as it were? I will not allow fear alone to make me mad. My enemy shall not find it too easy. He may kill my body, but that is all—”

These were the last words which Asta Langen had written in her notebook, the little book which was the only confidant of her terrible need. When the detective had finished reading it, he closed his eyes for a few minutes to let the impression made by the story sink into his mind.

Then he rose and put on his overcoat. He entered the commissioner’s room and took up his hat and cane.

“Where are you going, Muller?” asked Herr Von Mayringen.

“To Cathedral Lane, if you will permit it.”

“At this hour? it is quarter past eleven! Is there any such hurry, do you think? There is no train from any of our stations until morning. And I have already sent a policeman to watch the house. Besides, I know that Fellner is a highly respected man.

“There is many a man who is highly respected until he is found out,” remarked the detective.

“And you are going to find out about Fellner?” smiled the commissioner. “And this evening, too?”

“This very evening. If he is asleep I shall wake him up. That is the best time to get at the truth about a man.”