They remained in the narrow, low-roofed little cell for a full half-hour, making careful examination of everything, and discussing the probability of the Whispers heard in the courtyard above emanating from that hidden chamber.

For what purpose was the place used, and by whom? In all probability it was the very chamber in which Cardinal Setoun had been treacherously done to death.

Though they made a most minute investigation they discovered nothing further. Up to a certain point their explorations had been crowned by success, yet the discovery rather tended to increase the mystery than diminish it.

That the Whispers were supernatural Gabrielle had all along refused to believe. The question was, to what use that secret chamber was put?

At last, more puzzled than ever, the pair, having extinguished the candles, emerged again into the light of day, closing and latching the little door after them.

Then, following the narrow secret path, they found that it wound through the bushes, and emerged by a circuitous way some distance along the glen, its entrance being carefully concealed by a big lichen-covered boulder which hid it from any one straying there by accident. So near was it to the house, and so well concealed, that no keeper had ever discovered it.

"Well," declared Gabrielle, "we've certainly made a most interesting discovery this morning. But I wonder if it really does solve the mystery of the Whispers?"

"Scarcely," Walter admitted. "We have yet to discover to whom the secret of the existence of that chamber is known. No doubt the Whispers are heard above through the crack in the roof. Therefore, at present, we had better keep our knowledge strictly to ourselves."

And to this the girl, of course, agreed.

They found Sir Henry seated alone in the sunshine in one of the big bay-windows of the drawing-room, a pathetic figure, with his blank, bespectacled countenance turned towards the light, and his fingers busily knitting to employ the time which, alas! hung so heavily upon his hands.

Truth to tell, with Flockart's influence upon him, he was not quite convinced of the sincerity of either Gabrielle or Walter Murie.

Therefore, when they entered, and his daughter spoke to him; his greeting was not altogether cordial.

"Why, dear dad, how is it you're sitting here all alone? I would have gone for a walk with you had I known."

"I'm expecting Goslin," was the old man's snappy reply. "He left Paris yesterday, and should certainly have been here by this time. I can't make out why he hasn't sent me a 'wire' explaining the delay."

"He may have lost his connection in London," Murie suggested.

"Perhaps so," remarked the Baronet with a sigh, his fingers moving mechanically.

Murie could see that he was unnerved and unlike himself. He, of course, was unaware of the great interests depending upon the theft of those papers from his safe. But the old man was anxious to hear from Goslin what had occurred at the urgent meeting of the secret syndicate in Paris.

Gabrielle was chatting gaily with her father in an endeavour to cheer him up, when suddenly the door opened, and Flockart, still in his travelling ulster, entered, exclaiming, "Good-morning, Sir Henry."

"Why, my dear Flockart, this is really quite unexpected. I--I thought you were abroad," cried the Baronet, his face brightening as he stretched out his hand for his visitor to grasp.

"So I have been. I only got back to town yesterday morning, and left Euston last night."

"Well," said Sir Henry, "I'm very glad you are here again. I've missed you very much--very much indeed. I hope you'll make another long stay with us at Glencardine."

The man addressed raised his eyes to Gabrielle's.

She looked him straight in the face, defiant and unflinching. The day of her self-sacrifice to protect her helpless father's honour and welfare had come. She had suffered much in silence--suffered as no other girl would suffer; but she had tried to conceal the bitter truth. Her spirit had been broken. She was obsessed by one fear, one idea.

For a moment the girl held her breath. Walter saw the sudden change in her countenance, and wondered.

Then, with a calmness that was surprising, she turned to her father, and in a clear, distinct voice said, "Dad, now that Mr. Flockart has returned, I wish to tell you the truth concerning him--to warn you that he is not your friend, but your very worst enemy!"

"What is that you say?" cried the man accused, glaring at her. "Repeat those words, and I will tell the whole truth about yourself--here, before your lover!"

The blind man frowned. He hated scenes. "Come, come," he urged, "please do not quarrel. Gabrielle, I think, dear, your words are scarcely fair to our friend."

"Father," she said firmly, her face pale as death, "I repeat them. That man standing there is as much your enemy as he is mine!"

Flockart laughed satirically. "Then I will tell my story, and let your father judge whether you are a worthy daughter," he said.

CHAPTER x.x.xVI

IN WHICH GABRIELLE TELLS A STRANGE STORY

Gabrielle fell back in fear. Her handsome countenance was blanched to the lips. This man intended to speak--to tell the terrible truth--and before her lover too! She clenched her hands and summoned all her courage.

Flockart laughed at her--laughed in triumph. "I think, Gabrielle," he said, "that you should put an end to this deceit towards your poor blind father."

"What do you mean?" cried Walter in a fury, advancing towards Flockart.

"What has this question--whatever it is--to do with you? Is it your place to stand between father and daughter?"

"Yes," answered the other in cool defiance, "it is. I am Sir Henry's friend."

"His friend! His enemy!"

"You are not my father's friend, Mr. Flockart," declared the girl, noticing the look of pain upon the afflicted old gentleman's face. "You have all along conspired against him for years, and you are actually conspiring with Lady Heyburn at this moment."

"You lie!" he cried. "You say this in order to shield yourself. You know that your mother and I are aware of your crime, and have always shielded you."

"Crime!" gasped Walter Murie, utterly amazed. "What is this man saying, dearest?"

But the girl stood, blanched and rigid, her jaw set, unable to utter a word.

"Let me tell you briefly," Flockart went on. "Lady Heyburn and myself have been this girl's best friends; but now I must speak openly, in defence of the allegation she is making against me."

"Yes, speak!" urged Sir Henry. "Speak and tell me the truth."

"It is a painful truth, Sir Henry; would that I were not compelled to make such a charge. Your daughter deliberately killed a young girl named Edna Bryant. She poisoned her on account of jealousy."

"Impossible!" cried Sir Henry, starting up. "I--I can't believe it, Flockart. What are you saying? My daughter a murderess!"

"Yes, I repeat my words. And not only that, but Lady Heyburn and myself have kept her secret until--until now it is imperative that the truth should be told to you."

"Let me speak, dad--let me tell you----"

"No," cried the old man, "I will hear Flockart." And, turning to his wife's friend, he said hoa.r.s.ely, "Go on. Tell me the truth."

"The tragedy took place at a picnic, just before Gabrielle left her school at Amiens. She placed poison in the girl's wine. Ah, it was a terrible revenge!"

"I am innocent!" cried the girl in despair.