"If anything goes wrong," he observed cautiously, "it will be most awkward. M. Kettering is of the aristocracy. It will get into the newspapers. If we have made a mistake—" He shrugged his shoulders forebodingly.

"The jewels now," said the Commissary, "what do you think he has done with them?"

"He took them for a plant, of course," said M. Carrège; "they must have been a great inconvenience to him and very awkward to dispose of."

Poirot smiled.

"I have an idea of my own about the jewels. Tell me, Messieurs, what do you know of a man called the Marquis?"

The Commissary leant forward excitedly.

"The Marquis," he said, "the Marquis? Do you think he is mixed up in this affair, M. Poirot?"

"I ask you what you know of him."

The Commissary made an expressive grimace.

"Not as much as we should like to," he observed ruefully. "He works behind the scenes, you understand. He has underlings who do his dirty work for him. But he is some one high up. That we are sure of. He does not come from the criminal classes."