"It is a mystery to me, Boolba," she said, "for what interest can this great lady have in an old Jew?"

"The old Jew is rich," said Boolba significantly.

"So also is Irene Yaroslav," said the girl. "It is not for money that she comes."

"It is not for money," agreed the other, "it is for something else. When the Grand Duchess Irene was a child, she was in the streets of Kieff one day in charge of her nurse. It happened that some Caucasian soldiers stationed in the town started a pogrom against the Jews. The soldiers were very drunk; they were darting to and fro in the street on their little horses, and the nurse became frightened and left the child. Your father was in hiding, and the soldiers were searching for him; yet, when he saw the danger of the Grand Duchess, he ran from his hiding-place, snatched her up under the hoofs of the horses, and bore her away into his house."

"I did not know this," said Sophia, listening open-mouthed. Her father had never spoken of the incident, and the curious affection which this high-born lady had for the old usurer of Kieff had ever been a source of wonder to her.

"You know it now," said Boolba. "The Grand Duke has long since forgotten what he owes to Israel Kensky, but the Grand Duchess has not. Therefore, she comes to him with all her troubles—and that, Sophia Kensky, is why we have sent for you."

There was a silence.

"I see," she said at last, "you wish me to spy upon Israel Kensky and tell you all that happens."

"I want to know all that passes between him and the Grand Duchess," said Boolba. "She comes to London to-morrow with her father, and it is certain she will seek out Israel Kensky. Every letter that passes between them must be opened."

"But——" she began.