"Is his presence here a surprise to you likewise?" Sanderson managed to ask.
"Yes. Although I knew he had left the hospital in New York. But his appearance here amazed me——"
She was about to add "frightened me"; then she felt that Sanderson should not be needlessly alarmed. And the Herr Doktor had promised to say nothing. Sanderson's thought had leaped to another topic, and one that had before smote upon his mind. Belinda suddenly whispered:
"Oh, Frank, you are in such great danger here! How shall I get you away from these Germans?"
"Listen! Never mind me at present, Belinda. I am safe for a while at least. But there is another who is not—who is in deadly and hourly peril because of my accident."
"Who?" she asked in surprise.
"I left him—when was it? Yesterday afternoon? I was to meet him at a certain place at daybreak to-morrow morning. The spot is all of twenty kilometres from here. He must be warned. He will have to make his way as best he can through the German lines and to the French forces. But if he waits for me he is sure to be caught."
"A spy?" she gasped.
"Yes. Renaud. A really wonderful man, for years a detective of the metropolitan police—one of the shrewdest they say in Paris. He would be a distinct and an irreparable loss to the French cause. He must be warned, Belinda! He must be warned!"