"Then it's that of a woman who's her double!" exclaimed Matherfield. "I'll lay anything that if you asked a hundred men who've seen Lady Riversreade if that's her picture, they'd swear it is!"

"I see," said Hetherwick, disregarding his companion's outburst, "that this purports to be a portrait of a Madame Listorelle, who is described in the accompanying letterpress as a famous connoisseur of precious stones. Now, in relation to what we're discussing, may I ask a plain question? Who is Madame Listorelle?"

Blenkinsop smiled—oracularly.

"Madame Listorelle," he replied, "is the twin sister of Lady Riversreade!"

CHAPTER XVI

STILL MORE

Blenkinsop's sudden announcement, not altogether unexpected by Hetherwick as a result of the last few minutes' proceedings, seemed to strike Matherfield with all the force of a lightning-like illumination. His mouth opened; his eyes widened; he turned on Hetherwick as if, having been lost for a while in a baffling maze, he had suddenly seen a way pointed out to him.

"Oh, that's it, is it?" he exclaimed. "A twin sister, eh? Then—but go on, Mr. Blenkinsop; I'm beginning to see things."

"The matter is doubtless puzzling—to outsiders," responded Blenkinsop. "To clear it up, I shall have to go into some family history. Lady Riversreade and Madame Listorelle are, I repeat, twin sisters. They are the daughters of a man who in his time was captain of various merchant ships—the old sailing ships—and who knocked about the world a good deal. He married an American woman, and his two daughters were born in Galveston, Texas. They were educated in America—but there's no need to go into the particulars of their early lives——"