“Miss Simmons,” he said, “when I thought it expedient to install a private detective in this house, I insisted on Wragge’s sending you. We had worked together before . . .”

“Sixteenth of December, 1918, to January twelve, 1919, when you were secretary to Mr. Horace Jevons, the American millionaire,” said Miss Simmons as promptly as if he had touched a spring. It was her hobby to remember dates with precision.

“Exactly. I insisted upon your being sent because I knew from experience that you were reliable. At that time I looked on your presence here merely as a precautionary measure. Now, I am sorry to say . . .”

“Did someone steal Lady Constance’s necklace to-night?”

“Yes!”

“When the lights went out just now?”

“Exactly.”

“Well, why couldn’t you say so at once? Good gracious, man, you don’t have to break the thing gently to me.”

The Efficient Baxter, though he strongly objected to being addressed as “man,” decided to overlook the solecism.

“The lights suddenly went out,” he said. “There was a certain amount of laughter and confusion. Then a piercing shriek . . .”