It was not possible for me to follow the immediate steps taken by my friend, for I had some pressing professional business of my own, but I met him by appointment that evening at Simpson’s, where, sitting at a small table in the front window and looking down at the rushing stream of life in the Strand, he told me something of what had passed.

“Johnson is on the prowl,” said he. “He may pick up some garbage in the darker recesses of the underworld, for it is down there, amid the black roots of crime, that we must hunt for this man’s secrets.”

“But if the lady will not accept what is already known, why should any fresh discovery of yours turn her from her purpose?”

“Who knows, Watson? Woman’s heart and mind are insoluble puzzles to the male. Murder might be condoned or explained, and yet some smaller offence might rankle. Baron Gruner remarked to me⁠—”

“He remarked to you!”