She was silent for a moment. She seemed to be waiting for some suggestion from him. None came.

"The Carlton at five," she murmured. "I am angry with Andrea. I feel, even, that I could break his wonderful violin in two!"

Peter sighed once more.

"I should like to twist von Hern's neck!" he declared. "Lucky for him that he's in St. Petersburg! Let us forget this unpleasant matter, mademoiselle. The evening has been too delightful for such memories."

Mademoiselle Celaire turned to her escort as soon as they were alone in the car.

"As an escort, let me tell you, my dear Baron," she exclaimed, with some pique, "that you are a miserable failure! For the rest——"

"For the rest, I will admit that I am puzzled," Peter said. "I need to think. I have the glimmerings of an idea—no more."

"You will act? It is an affair for us—for the Double Four?"

"Without a doubt—an affair and a serious one," Peter assured her. "I shall act. Exactly how I cannot say until after to-morrow."

"To-morrow?" she repeated.