"But he knew your name," Harcutt reminded him. "I noticed that." "Yes. I suppose he could find me if he wished to," Wolfenden admitted. "If he had been very keen about it, though, I should think he would have said something more. His one idea seemed to be to get away before there was a row." "I do not think," Harcutt said, "that you will find him overburdened with gratitude. He does not seem that sort of man." "I do not want any gratitude from him," Wolfenden answered, deliberately. "So far as the man himself is concerned I should rather prefer never to see him again. By the bye, did either of you fellows follow them home last night?" Harcutt and Densham exchanged quick glances. Wolfenden had asked his question quietly, but it was evidently what he had come to know. "Yes," Harcutt said, "we both did. They are evidently people of some consequence. They went first to the house of the Russian Ambassador, Prince Lobenski." Wolfenden swore to himself softly. He could have been there. He made a mental note to leave a card at the Embassy that afternoon. "And afterwards?" "Afterwards they drove to a house in Chilton Gardens, Kensington, where they remained." "The presumption being, then----" Wolfenden began. "That they live there," Harcutt put in. "In fact, I may say that we ascertained that definitely. The man's name is 'Sabin,' and the girl is reputed to be his niece. Now you know as much as we do. The relationship, however, is little more than a surmise." "Did either of you go to the reception?" Wolfenden asked. "We both did," Harcutt answered. Wolfenden raised his eyebrows. "You were there! Then why didn't you make their acquaintance?" Densham laughed shortly. "I asked for an introduction to the girl," he said, "and was politely declined. She was under the special charge of the Princess, and was presented to no one." "And Mr. Sabin?" Wolfenden asked. "He was talking all the time to Baron von Knigenstein, the German Ambassador. They did not stay long." Wolfenden smiled. "It seems to me," he said, "that you had an excellent opportunity and let it go." Harcutt threw his cigarette into the fire with an impatient gesture. "You may think so," he said. "All I can say is, that if you had been there yourself, you could have done no more. At any rate, we have no particular difficulty now in finding out who this mysterious Mr. Sabin and the girl are. We may assume that there is a relationship," he added, "or they would scarcely have been at the Embassy, where, as a rule, the guests make up in respectability what they lack in brilliancy." "As to the relationship," Wolfenden said, "I am quite prepared to take that for granted. I, for one, never doubted it."