“Then the family were in town on the date I mention.”

He considered a moment.

“Oh! Of course they were. They must have been.”

I glanced again around the room, full of amazement and wonder.

The man’s failure to give me any details regarding the extremely attractive girl who had died upon his mistress’s bed held me gripped in uncertainty. The mystery was even more puzzling now that I had started to investigate.

As I stood in that room a thousand strange reflections flashed across my mind.

Why had I, a mere passer-by, been called in so suddenly to be taken into the intimacy of the millionaire’s household? Was it by mere accident that I had been invited in, or was it by careful design? I had lost five thousand pounds by foolish speculation, and yet I had regained it by being party to a criminal offence.

Again, who was the pretty, dark-haired girl who had first uttered those hysterical screams, and then, while fully dressed, had died upon Mrs. De Gex’s bed? Further, if the mysterious dead girl had been niece of the millionaire surely my friend the caretaker would have known her?

I confess that I now became more bewildered than ever.