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 person who has passed for his sister is really his wife."

Mrs. Lyons had resumed her seat. Her hands were grasping the arms of her chair, and I saw that the pink nails had turned white with the pressure of her grip.

"His wife!" she said, again. "His wife! He is not a married man."

Sherlock Holmes shrugged his shoulders.

"Prove it to me! Prove it to me! And if you can do so!" The fierce flash of her eyes said more than any words.

"I have come prepared to do so," said Holmes, drawing several papers from his pocket. "Here is a photograph of the couple taken in York four years ago. It is indorsed 'Mr. and Mrs. Vandeleur,' but you will have no difficulty in recognizing him, and her also, if you know her by sight. Here are three written descriptions by trustworthy witnesses of Mr. and Mrs. Vandeleur, who at that time kept St. Oliver's private school. Read them and see if you can doubt the identity of these people."