“I have found your father,” he said, “and your carriage is waiting. I thought that if Reist would excuse me for half-an-hour——”

Reist interrupted him at once.

“You must not go away,” he declared, earnestly. “Not for five minutes. Believe me it is necessary.”

“My dear fellow——” Ughtred protested.

“Is it possible,” Reist exclaimed, with some impatience, “that you do not recognize the great misfortune of this evening? I was wrong to allow you to come—to be seen in London with you. Prince Alexis is more than an ordinary ambassador. He is a born diplomatist, a true Russian—he is one of the clique who to-day rule the country. With Hassen’s aid he has, without a doubt, surmised the purport of my visit to you. By this time he is hard at work. Let me tell you that if he can prevent it you will never set foot in Theos. There must be no more delay. Come!”

Sarah held out her hand. Her eyes met his frankly.

“The Duke of Reist must be obeyed,” she said. “I am sure that he is right. Good-bye, Prince Ughtred! You are very fortunate, for you have a great and noble work before you. May you succeed in it. I shall hope and pray for your success.”

A little abruptly she turned away and took her father’s arm. The two men watched them disappear—the little grey-headed man with his ill-cut clothes, and hard, shrewd face, and the tall, graceful girl, whose toilette was irreproachable, and whose carriage and bearing moved even Reist to admiration. They passed down the carpeted way and through the swing-doors. Then Reist touched his companion on the arm.

“It is half-past eleven,” he said. “We are going to catch the twelve o’clock train from Charing Cross.”