“There are some very famous rubies,” said Poirot, “originally part of the Crown jewels of Russia; they are unique in character, and their value is almost fabulous. There has been a rumour that they have lately passed into the possession of an American. Are we right in concluding, Monsieur, that you were the purchaser?”

“Yes,” said Van Aldin. “They came into my possession in Paris about ten days ago.”

“Pardon me, Monsieur, but you have been negotiating for their purchase for some time?”

“A little over two months. Why?”

“These things become known,” said Poirot. “There is always a pretty formidable crowd on the track of jewels such as these.”

A spasm distorted the other’s face.