There was no light on the stair; but our conversation--Mr. Leroux was
speaking in a very high-pitched voice"...

"What was he saying?"

"He was explaining to me how some woman, unknown to him, had interrupted
his work a few minutes before by ringing his door-bell."...

Inspector Dunbar held up his hand.

"I won't ask you to repeat what he said, doctor; Mr. Leroux, presently,
can give me his own words."

"We had descended to this floor, then," resumed Cumberly, "when Mr.
Exel, entering below, called up to us, asking if anything was the
matter. Leroux replied, 'Matter, Exel! There's a devil of a business!
For mercy's sake, come up!'"

"Well?"

"Mr. Exel thereupon joined us at the door of this flat."

"Was it open?"

"Yes. Mr. Leroux had rushed up to me, leaving the door open behind him.
The light was out, both in the lobby and in the study, a fact upon which
I commented at the time. It was all the more curious as Mr. Leroux had
left both lights on!"...

"Did he say so?"