"I suppose you must give vent to your feelings sometimes," he said. "And now that you have had a little fling we had better get on with our business. You will go with Padini to-night to----"

"No, no!" Serena cried. "I implore you to spare me that humiliation again. What have I done that I should have to endure all this--what can be possibly gained by it?"

For the first time Anstruther displayed real signs of anger. "Now, listen to me," he said. "Once for all, I tell you not to speak to me like this again. Do you think I have studied you all these years for nothing? Do you suppose I do not know how disloyal you are in your heart towards me? There is one class of woman who has to be ruled by fear alone, and you are one of them. You will do to-night what I ask you, not merely to-night, but by months and years, in and out, it will be for me to order and you to obey. And, whilst we are on the subject you are to say nothing further than you have already said to Mr. Masefield. You understand what I mean?"

It was quite evident that Serena understood the full significance of Anstruther's speech. Pale as her face had been before, it turned now to a still more deathly pallor. She essayed to speak, but her lips refused the office.

"I don't quite follow you," she managed to stammer out at length. "If you accuse me of disloyalty----"

Anstruther intimated that that was exactly what he did mean. It was rather an uncomfortable moment for Jack, listening there. He was beginning to fully realize the marvelous cunning of the man with whom he had to deal. He wondered how it was possible for Anstruther to discover the gist of his conversation with Serena that afternoon. He was saying something of this in a whisper to Rigby when Padini returned to the room. The violinist was dressed now exactly as he had been attired two nights before when Jack had seen him at Carrington's chambers. His jaunty air for the moment had vanished; he looked suspicious and uneasy. Anstruther's keen eye noticed this as it noticed everything.

"Now, what's the matter?" he asked. "Have you seen a ghost or something equally terrible?"

"No, I haven't," Padini replied sulkily. "But lam pretty sure there is somebody in the house. I am ready to swear that I saw the shadow of a man moving on the landing outside."

With a contemptuous smile Anstruther walked towards the door. There was perhaps no immediate danger for the listeners, seeing that Anstruther evidently attached no importance to Padini's statement; but it was just as well to be on the safe side. Rigby slipped quietly into a doorway leading to a bedroom and dragged Jack in after him. Then he closed the door very gently and waited for further developments. He had not long to wait, for almost immediately there was a click of the latch, and Anstruther's receding footsteps melted into silence.

"Well, that sets your mind at ease," Anstruther was heard to say. "If there are any birds here, I have them safely caged."