And from my waistcoat pocket I produced the missing button of enamel.

"Where did you find it?" inquired Miss Belsize, with an admirably slight increase of astonishment in voice and look. "And how did you know it was mine?" came quickly in the next breath.

"I didn't know," I answered. "I guessed. It was the shot of my life!"

"But you don't say where you found it?"

"In an empty house not far from here."

She had held her breath; now I felt it like the lightest zephyr. And quite unconsciously I had retained the enamel button.

"Well, Mr. Manders? I'm very much obliged to you. But may I have it back again?"

I returned her property. We had been staring at each other all the time. I stared still harder as she repeated her perfunctory thanks.

"So it was you!" I said, and was sorry to see her looking purposely puzzled at that, but thankful when the reckless light outshone all the rest in those chameleon eyes of hers.

"Who did you think it was?" she asked me with a frosty little smile.