It was after I had told Quarles the result of my inquiries, and we had argued ourselves into silence, that he burst out with his remark about the body, and of course what he said was true enough. Still, I was inclined to think that Madame Vatrotski was dead. I did not believe she had disappeared as an advertisement: there was no earthly reason why she should, since her popularity had shown no signs of being on the wane, and to attribute the mystery to a Nihilist plot was not a solution which appealed to me.

"She may have returned to her rooms and met Sir Charles," Zena suggested, after a pause. "Perhaps she found him waiting in his car at the door and went off at once."

"Why do you make such a suggestion?" asked Quarles.

"She had plenty of time to keep the appointment; indeed, it almost looks as if she had arranged her morning on purpose to keep it. If she had gone with him at once her maid would not know she had returned."

Quarles looked at me.

"The same idea occurred to Paul Renaud," I said. "I can find no evidence that Sir Charles went to Maidenhead that day, and at three o'clock in the afternoon he was certainly at his club."

"Did he telephone to madame or attempt to communicate with her in any way?" Quarles asked.

"He says not."

"But you do not altogether believe him, eh?"

"My opinion is in abeyance," I returned. "It is only fair to say that Sir Charles suggested that Paul Renaud may have seen her at the shop in Regent Street. They are suspicious of each other. Renaud was certainly on the premises at the time she was there. Personally I do not attribute much weight to these suspicions. I believe both men are genuine lovers, and would be the last persons in the world to do the dancer any harm."