“Miss Berry,” I said severely, “I wonder that you can look me in the face. I trusted you as a woman, and you have outraged that trust. I never dreamed that you were—that you were an adventuress. It was certainly a clever plot, and but for the smartness of the police I should, in my innocence, have fallen a victim to your designs. For myself, I am grateful to the police. I can understand and excuse their mistake in regarding me as your accomplice. That will soon be set right, for Lord Trent will be here. In the meantime, of course, I have been put to considerable humiliation. Nevertheless, even this is better than having followed you to your ‘sister’s.’ In your ‘sister’s’ lodging I might have been knocked senseless, or even murdered. Moreover, the emeralds are safe.”

She put on an innocent expression, playing the injured maiden.

“Mr. Saunders, you surely do not imagine——”

“Miss Berry, no protestations, I beg. Let me say now that I have always detected in your character something underhand, something crafty.”

“I swear——” she began again.

“Don’t trouble,” I interrupted her icily, “for I shall not believe you. This night will certainly be a warning to me.”

With that I leaned my back against the mantelpiece, and abandoned myself to gloomy thought. It was a moment for me of self-abasement. I searched my heart, and I sorrowfully admitted that my predicament was primarily due to disobeying that golden rule—beware of women. I saw now that it was only my absurd fancy for this wicked creature which had led me to accept the office of guarding those emeralds during their night-passage across Eaton Square. I ought to have refused in the first place, for the job was entirely outside my functions; strictly, the butler should have done it.

And this woman in front of me—this Susan Berry, in whom the old Marchioness had such unbounded trust! So she belonged to the con-fraternity of jewel thieves—a genus of which I had often read, but which I had never before met with. What audacity such people must need in order to execute their schemes!

But then the game was high. The Cockfosters emeralds were worth, at a moderate estimate, twelve thousand pounds. There are emeralds and emeralds, the value depends on the colour; these were the finest Colombian stones, of a marvellous tint, and many of them were absolutely without a flaw. There were five stones of seven carats each, and these alone must have been worth at least six thousand pounds. Yes, it would have been a great haul, a colossal haul.

Time passed, the candle was burning low, and there was no sign of Lord Trent. I went to the door and knocked, first gently, then more loudly, but I could get no answer. Then I walked about the room, keeping an eye on Susan Berry, who had, I freely admit, the decency to avoid my gaze. I was beginning to get extremely tired. I wished to sit down, but there was only one form; Susan Berry was already upon it, and, as I said before, it was a very short form. At last I could hold out no longer. Taking my courage in both hands, I sat down boldly at one end of the form. It was a relief to me. Miss Berry sighed. There were not six inches between us.