THE MYSTERIOUS AFFAIR AT STYLES
in his fingers finally selected one, very bright and shining, which he tried in the lock of the purple despatch-case. It fitted, and he opened the box, but after a moment's hesitation, closed and relocked it, and slipped the bunch of keys, as well as the key that had originally stood in the lock, into his own pocket.
"I have no authority to go through these papers. But it should be done—at once!"
He then made a very careful examination of the drawers of the wash-stand. Crossing the room to the left-hand window, a round stain, hardly visible on the dark brown carpet, seemed to interest him particularly. He went down on his knees, examining it minutely—even going so far as to smell it.
Finally, he poured a few drops of the coco into a test tube, sealing it up carefully. His next proceeding was to take out a little notebook.
"We have found in this room," he said, writing busily, "six points of interest. Shall I enumerate them, or will you?"
"Oh, you," I replied hastily.
"Very well, then. One, a coffee-cup that has been ground into powder; two, a despatch-case with a key in the lock; three, a stain on the floor."
"That may have been done some time ago," I interrupted.
"No, for it is still perceptibly damp and smells
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