“Not to work without suspicion. You ordered me to work slowly. It will require patient effort. I am anxious to let him mention the subject of the jewels of his own accord.”

“That is best. You are right. Proceed cautiously. If you obtain unexpected results, give the usual signal. Stop in front of the Pink Rat, at eight o’clock. Wait there five minutes; but do not enter.”

Prokop pointed to the inner room. The girl joined the others.

A few seconds later, there was another tap at the door. A ruddy-faced man with a short-clipped mustache was admitted by Prokop.

“Agent K,” he said, in guttural tones.

“Correct.”

The man appeared to be a German. He stepped methodically across the room, and garbed himself in one of the cowled robes.

“Report, Agent K.”

The German spoke in English. His voice was low and thick. Prokop listened closely, intent upon every word.

“Zuvor was at the club to-night,” he said. “He returned shortly before I came away.”