Very stealthily we heard it pass along until it died away in the distance. Then the baronet gently opened his door and we set out in pursuit. Already our man had gone round the gallery, and the corridor was all in darkness. Softly we stole along until we had come into the other wing. We were just in time to catch a glimpse of the tall, black-bearded figure, his shoulders rounded, as he tiptoed down the passage. Then he passed through the same door as before, and the light of the candle framed it in the darkness and shot one single yellow beam across the gloom of the corridor. We shuffled cautiously towards it, trying every plank before we dared to put our whole weight upon it. We had taken the precaution of leaving our boots behind us, but, even so, the old boards snapped and creaked beneath our tread. Sometimes it seemed impossible that he should fail to hear our approach. However, the man is fortunately rather deaf, and he was entirely preoccupied in that which he was doing. When at last we reached the door and peeped through we found him crouching at the window, candle in hand, his white, intent face pressed against the pane, exactly as I had seen him two nights before.

We had arranged no plan of campaign, but the baronet is a man to whom the most direct way is always the most natural. He walked into the room, and as he did so Barrymore sprang up from the window with a sharp hiss of his breath and stood, livid and trembling, before us. His dark eyes, glaring out of the white mask of his face, were full of horror and astonishment as he gazed from Sir Henry to me.

“What are you doing here, Barrymore?”

“Nothing, sir.” His agitation was so great that he could hardly speak, and the shadows sprang up and down from the shaking of his candle. “It was the window, sir. I go round at night to see that they are fastened.”

“On the second floor?”

“Yes, sir, all the windows.”

“Look here, Barrymore,” said Sir Henry sternly, “we have made up our minds to have the truth out of you, so it will save you trouble to tell it sooner rather than later. Come, now! No lies! What were you doing at that window?”

The fellow looked at us in a helpless way, and he wrung his hands together like one who is in the last extremity of doubt and misery.

“I was doing no harm, sir. I was holding a candle to the window.”

“And why were you holding a candle to the window?”

“Don’t ask me, Sir Henry - don’t ask me! I give you my word, sir, that it is not my secret, and that I cannot tell it. If it concerned no one but myself I would not try to keep it from you.”

A sudden idea occurred to me, and I took the candle from the trembling hand of the butler.

“He must have been holding it as a signal,” said I. “Let us see if there is any answer.” I held it as he had done, and stared out into the darkness of the night. Vaguely I could discern the black bank of the trees and the lighter expanse of the moor, for the moon was behind the clouds. And then I gave a cry of exultation, for a tiny pin-point of yellow light had suddenly transfixed the dark veil, and glowed steadily in the centre of the black square framed by the window.

“There it is!” I cried.

“No, no, sir, it is nothing - nothing at all!” the butler broke in; “I assure you, sir- -”

“Move your light across the window, Watson!” cried the baronet. “See, the other moves also! Now, you rascal, do you deny that it is a signal? Come, speak up! Who is your confederate out yonder, and what is this conspiracy that is going on?”

The man’s face became openly defiant.

“It is my business, and not yours. I will not tell.”

“Then you leave my employment right away.”

“Very good, sir. If I must I must.”