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 ing along as though just taking a breath of air. At a moment when she is unobserved, she hurriedly crosses to the other platform, and takes the first train back to Paris and the Ritz Hotel. Her name has been registered there as taking a room the night before by one of Knighton's female accomplices. She has nothing to do but wait there placidly for your arrival. The jewels are not, and never have been, in her possession. No suspicion attaches to him, and, as your secretary, he brings them to Nice without the least fear of discovery. Their delivery there to Monsieur Papopolous is already arranged for and they are entrusted to Mason at the last moment to hand over to the Greek. Altogether a very neatly planned coup, as one would expect from a master of the game such as the Marquis."

"And you honestly mean that Richard Knighton is a well-known criminal, who has been at this business for years?"

Poirot nodded.

"One of the chief assets of the gentleman called the Marquis was his plausible, ingratiating manner. You fell a victim to his charm, Monsieur Van Aldin, when you engaged him as a secretary on such a slight acquaintanceship."

"I could have sworn that he never angled for the post," cried the millionaire.

"It was very astutely doneso astutely done that it deceived a man whose knowledge of other men is as great as yours is."

"I looked up his antecedents too. The fellow's record was excellent."

"Yes, yes; that was part of the game. As Richard