“It was on the sideboard in the dining-room. Sir Philip always had whisky and soda for dinner.”

“Was the bottle you took him at night the same bottle out of which Sir Philip had had whisky at dinner?”

“Yes.”

“You are sure of that?”

“Yes—quite. I poured it out myself at dinner.”

“You see the point of my question?”

“I am not sure—”

“No; but we will return to that later. As far as you know, the bottle you took Sir Philip was the one from which you had given him whisky at dinner?”

“I am quite sure it was the same.”

I confess I did not quite see the bearing of that question, but I gathered from Pepster’s attitude that he, at all events, attached some importance to it, and I was content to wait.