she stopped.
For the corridor was no longer in darkness. Some ten or fifteen yards ahead of her in the centre of the floor and on the thick pile of the Persian carpet was a round nebulous trembling orb of flickering blue flame. The rays rose and fell just as a fire does in a dark room, and for the moment Beatrice thought the boards were on fire.
But the peculiar dead-blue of the flame and its round shape did not fit in with this theory. The fire was apparently feeding upon nothing, and as Beatrice stood there fascinated she saw it roll a yard or two like a ball. It moved just as if a sudden draught had caught it – this strange will-o'-the-wisp at large in a country house. Beatrice shivered with apprehension wondering what was going to happen next. She could not move, she could not call out, for she was now past words. She could only watch and wait developments, her heart beating fast.
And developments came. For the best part of a yard a fairly strong glow surrounded the sobbing blue flame. Out of the glow came a long, thin, brown hand and arm, the slim fingers grasping a small brass pot and holding it over the flame. Almost immediately a dusty film rose from the pot and once again that sickly sweet perfume filled the corridor. Beatrice swayed before it, her senses soothed, her nerves numbed, until it seemed to her that she was falling backwards to the ground. A pair of arms caught her and she was lifted from the floor and carried swiftly along to her own room. It was all like a dream, from which she emerged by and by, to find herself safe and sound and the door of her room closed. She shook off the fears that held her in a grip of iron and laid her hand on the door knob. The lock was fastened on the outside.
What did it mean? What terrible things were happening on the other side of that locked door? It was useless to cry for help, for the walls were thick and no one slept in the same corridor but herself. All the servants had gone to bed long ago. Therefore, to ring the bell for help would be useless. All Beatrice could do was to wait and hope for assistance, and pray that this blue terror overhanging the house was not destined to end in tragedy. Perhaps this was an ingenious method by which modern thieves rifled houses with impunity and got away with their plunder before alarm could be raised. It seemed feasible, especially as she recollected that her dog had not challenged the intruders. She hoped nothing had happened to the terrier. She could not forget her tiny favourite even at this alarming moment.
Meanwhile, help was near at hand, as Beatrice expected. In the billiard-room Wilfrid Mercer had come to his senses, and made a dash for the window. He knew now that some dire catastrophe was at hand. He did not doubt that this was the work of the two strangers whom he had seen under the trees. In fact, with the scent burning and stinging in his nostrils there was no room for question. Whether the stuff was fatal or not he did not know and there was no time to ask. The thing to do was to create a powerful current throughout the house and clear the rooms and passages.
He thought of many things in that swift moment. His mind went flashing back to the time when he had encountered the dead Englishman in the Borneo hut with that knotted skein about his forehead. He thought about the strange discovery in the afternoon when those five knots had so mysteriously appeared again. He thought most of all of Beatrice and wondered if she were safe. All this shot through his mind in the passing of a second between the time he rose from his chair and fumbled for the catch of the windows opening on to the lawn. He had his handkerchief pressed tightly to his face. He dared not breathe yet. His heart was beating like a drum.
But the catch yielded at last. One after the other the windows were thrown wide and a great rush of air swept into the room causing the plants to dance and sway and the masses of ferns to nod their heads complainingly. It was good to feel the pure air of heaven again, to fill the lungs with a deep breath, and note the action of the heart growing normal once more. The thing had passed as rapidly as it had come and Wilfrid felt ripe for action. He was bold enough to meet the terror in whatever way it lifted up its head. As he turned towards the hall Cotter staggered into the room. His face was white and he shook like a reed in the wind. His fat hands were rubbing nervously together and he was the very embodiment of grotesque, almost ludicrous, fright.
"After all these years," he muttered, "after all these years. I am a wicked old man, sir, a miserable old wretch who doesn't deserve to live. And yet I always knew it would come. I knew it well enough though Mr. Flower always said we had got the better of those people. But I never believed it, sir, I never believed it. And now when I have worked and toiled and slaved to enjoy myself in my old age I am going to die like this. But it wasn't my fault, sir. I didn't do it. It was Flower. And if I had only known what was going to happen I would have cut my right hand off rather than have gone to Borneo ten years ago."
"In the name of common sense, what are you jabbering about?" Wilfrid said impatiently.
But Cotter did not hear. He had not the remotest idea whom he was talking to. He wandered in the same childish manner, rubbing his hands and writhing as if he were troubled with fearful inward pains.
"Can't you explain?" Wilfrid asked. "So you two have been to Borneo together, eh? That tells me a good deal. In the meantime, what has become of Mr. Flower?"
Apparently Cotter had a glimmer of sense, for he grasped the meaning of the question.
"He is in there," he said vaguely, "in the library with them. Oh, why did I ever come to a place like this?"
Again the vague terror seemed to sweep down upon Cotter and sway him to and fro as if the physical agony were more than he could bear. It was useless to try to extract any intelligent information out of this sweat-bedabbled wretch. And whatever happened Flower must be left to his own devices for the moment. Doubtless he had brought all this upon himself, and if he had to pay the extreme penalty, why, then, the world would be little the worse for his loss. But there was somebody else whose life was far more precious. Wilfrid bent over the quaking Cotter and shook him by the shoulders much as a terrier shakes a rat.
"Now, listen to me, you trembling coward," he said between his teeth. "Try to get a little sense into that muddled brain of yours. Where is Miss Galloway, and where is she to be found?"
"Don't," Cotter groaned. "Do you want to murder me? I suppose Miss Galloway is in her bedroom."
"I can guess that for myself," Wilfrid retorted. "Show me her room."
"Oh, I will," Cotter whined. "But don't ask me to move from here, sir. It would be cruel. It is all very well for a young man like you who doesn't know – "
"If you won't come, I will take you by the scruff of your neck and drag you upstairs," Wilfrid said grimly.
He caught hold of Cotter's limp arm and propelled him up the stairs. The atmosphere was clean and sweet now, though traces of the perfume lingered. Cotter, hanging limply from Wilfrid's arm, pointed to a door. Then he turned and fled, holding on by the balustrade. It was no time to hesitate, so Wilfrid tapped at the door. His heart was in his mouth and he waited with sickening impatience for a reply. Suppose the mischief had been done! Suppose he should be too late! He had with difficulty saved himself. Then he gave a gasp of relief as he heard the voice of Beatrice asking who was there.
"It is I, Mercer," he said. "There is no time to lose. Will you unlock the door?"
CHAPTER IX
BEHIND LOCKED DOORS
"I cannot," Beatrice replied. Her voice was low, but to Wilfrid's relief quite steady. "The door is locked on the outside. I am so thankful you have come."
Wilfrid turned the key. With a great thrill of delight he saw that Beatrice was little the worse for what she had gone through. He indulged in no idle talk, but reached out his hand in search of one of the electric switches. Beatrice grasped Wilfrid's meaning. She stretched out her hand and immediately the corridor was flooded with light.
"I cannot understand it," she murmured. "Dr. Mercer, what does it mean?"
"Perhaps you had better tell me your experience first," Wilfrid suggested. "If I can throw any light afterwards on this hideous mystery I shall be glad."
"I'll tell you as collectedly as I can," Beatrice replied. "I had almost forgotten the alarm I had in the conservatory this afternoon when I came up to bed. I sat for a while dreaming over the fire – "
Beatrice stopped and a little colour crept into her