"I'll let you into a little secret, Monsieur Poirot," Miss Marvell was continuing. "We've got a deal on with Lord Yardly. There's some chance of our arranging to film a play down there in his ancestral pile."

"At Yardly Chase?" I cried, interested. "Why, it's one of the show places of England." Miss Marvell nodded.

"I guess it's the real old feudal stuff all right. But he wants a pretty stiff price, and of course I don't know yet whether the deal will go through, but Greg and I always like to combine business with pleasure."

"But - I demand pardon if I am dense, madame - surely it is possible to visit Yardly Chase without taking the diamond with you?"

A shrewd, hard look came into Miss Marvell's eyes which belied their childlike appearance. She looked suddenly a good deal older.

"I want to wear it down there."

"Surely," I said suddenly, "there are some very famous jewels in the Yardly collection, a large diamond amongst them?"

"That's so," said Miss Marvell briefly.

I heard Poirot murmur beneath his breath: "Ah, c'est comme ça!" Then he said aloud, with his usual uncanny luck in hitting the bull's-eye (he dignifies it by the name of psychology): "Then you are without doubt already acquainted with Lady Yardly, or perhaps your husband is?"

"Gregory knew her when she was out West three years ago," said Miss Marvell. She hesitated a moment, and then added abruptly: "Do either of you ever see Society Gossip?" We both pleaded guilty rather shamefacedly.

"I asked because in this week's number there is an article on famous jewels, and it's really very curious -" She broke off.

I rose, went to the table at the other side of the room and returned with the paper in question in my hand. She took it from me, found the article, and began to read aloud:

"... Amongst other famous stones may be included the Star of the East, a diamond in the possession of the Yardly family. An ancestor of the present Lord Yardly brought it back with him from China, and a romantic story is said to attach to it. According to this, the stone was once the right eye of a temple god. Another diamond, exactly similar in form and size, formed the left eye, and the story goes that this jewel, too, would in course of time be stolen. 'One eye shall go West, the other East, till they shall meet once more. Then, in triumph shall they return to the god.' It is a curious coincidence that there is at the present time a stone corresponding closely in description with this one, and known as 'the Star of the West,' or 'the Western Star.' It is the property of the celebrated film actress, Miss Mary Marvell. A comparison of the two stones would be interesting."

I stopped.

"Épatant!" murmured Poirot. "Without doubt a romance of the first water." He turned to Mary Marvell. "And you are not afraid, madame! You have no superstitious terrors? You do not fear to introduce these two Siamese twins to each other lest a Chinaman should appear and, hey presto!