The young man gazed stupidly at the detective, then lowered his head and said, in a voice broken with emotion: "No; I have no friends."

"That remains to be seen, Mr. Luke Filbon."

"My God! Do you know me?"

There was the ring of abject despair in the utterance.

"Yes, I know you now, if I did not know you before."

For a few moments there was silence. Then Nick asked: "What do you fear?"

"If I ever see daylight, I fear the anger and vengeance of one man."

"Gabriel Leonard?"

"Yes. How did you know?"

"By putting two and two together."