"I think that what you have said about the likelihood of the revolver having been seen is quite feasible," responded the detective. "But there is nothing to be gained by discussing that possibility at the present moment. Shall we go upstairs again, Miss Heredith?" he added, turning to her.

She turned on him a grateful glance for his tact and forbearance, and hastened to lead the way from the gun-room. The few words between Phil and Musard had not only brought sharply back to her all the past horror and agony of the murder, but had caused a poignant renewal of her apprehensions about her nephew's health. She realized that he was a changed being, moody and irritable, and liable to sudden fits of excitement on slight provocation. She felt that Musard had been rather inconsiderate to forget Phil's illness and cause him to get excited by differing from him.

Her concern was not lessened by intercepting a strange glance which Phil cast at Musard when they reached the library. Before she had time to reflect on what it meant, Phil turned to her and asked her where she had put Violet's jewel-case.

"I told you yesterday, Phil, that I brought it downstairs and locked it up," replied Miss Heredith, with a glance at the safe in the corner of the room. "I have been keeping the keys until you got better."

"Then you might let me have them now," said the young man. "I should like to see if the jewels are all right."

"Why, Phil, of course they are all right," his aunt replied. "We found the jewel-case locked, and not tampered with in any way."

"Was Mrs. Heredith's jewel-case in her bedroom the night she was murdered?" asked Colwyn.

"Yes," responded Miss Heredith. "We found it on her toilet-table, where she usually kept it."

"Did it contain valuable jewels?"

"It contained a necklace of pearls which was given to poor Violet by Sir Philip," was the reply. "It is an old family necklace."

"Then I agree with Mr. Heredith that the jewel case should be opened."

"Very well. As you think it necessary, I will go to my room for the keys."

Miss Heredith left the library, and returned in a few moments with a small bunch of keys in her hand. She went to the safe, unlocked it, and returned to the table bearing an oblong silver box of quaint design, with the portrait of a stout simpering lady in enamel on the cover. Miss Heredith directed Colwyn's attention to the portrait, remarking that it was a likeness of a princess of the reigning house, who had given it and the box to her great-uncle, Captain Sir Philip Heredith.

"Her Royal Highness held my great-uncle in much esteem, Mr. Colwyn," she added, as she proceeded to fit one of the keys into the box. "He was one of the most famous of Nelson's captains. When he died the residents of his native town erected a memorial to him. It was inscribed with testimony to his worth in a civic, military, and Christian capacity, together with a text stating that he caused the widow's heart to sing for joy. Beneath the text was commemorated his feat in sinking the French frigate L'equille, with every soul on board."

"That hardly seems like causing the widow's heart to sing for joy," commented Musard.

"The reference was to English widows, Vincent," replied Miss Heredith, proceeding to open the box with loving care. "At that period of our history we had not discovered the good qualities of the French people, which have endeared them to-Oh!" Miss Heredith broke off with a startled exclamation as the lid of the silver box fell back, revealing an empty interior.

It is only in moments of complete surprise that the human face fails to keep up some semblance of guard over the inmost feelings. At the discovery that the jewel-case was empty Miss Heredith's dignity dropped from her like a falling garment, and she stared at the velvet interior with half-open mouth and an air of consternation on her face.

"Oh!" she cried again, finding voice after a moment's tense silence. "The necklace is gone."

"By heaven, this is amazing," muttered Musard.

"I thought you said it was safe?" The speaker was Phil. He did not look at his aunt as he uttered this reproach, but gazed at the empty box with glowing eyes under drawn brows.

"Phil, Phil, I thought it was safe-oh, I thought it was safe!" cried Miss Heredith almost hysterically. "Where is it gone? Who could have taken it? The box was locked when we saw it upstairs, and the day after the funeral I found Violet's keys at the back of the drawer where she always kept them."

"The box may have been locked when you found it, but it seems equally certain that it was also empty," said Colwyn. He alone of the excited group was cool enough to estimate the awkward possibilities of this discovery. "How was it that the detectives did not open the jewel-case on the night of the murder, so as to make quite sure that the necklace had not been stolen?"

"I took the necklace downstairs and locked it away before the police arrived," said Miss Heredith tearfully. "When Detective Caldew came he asked me if anything was missing from Violet's bedroom, and I told him no. Of course, I did not dream of anything like this. Oh, how I wish now that I had opened the jewel-case at the time. But I never thought. I tried the case and found it locked, so I thought it had not been touched."

"Really, I am more to blame than Miss Heredith," interposed Musard hurriedly. "I saw the jewel-case first, and I should have thought of having it opened."

"It is a pity you did not inform the detectives about the case," said Colwyn. His face was grave as he realized how completely the police had been led astray in their original investigations by the misunderstanding which had concealed an important fact. "But first let us make sure that the jewel-case was empty when it was brought downstairs. How many people have access to this safe, Miss Heredith? Is there more than one key?"

"There is only one key," she replied. "And that has been in my possession since the night of the murder."

"That disposes of that possibility, then. What about Mrs. Heredith's bunch of keys? Have they also been in your possession since she was killed?"

"Yes; I kept them in an upstairs drawer, which was locked."

"Can you tell me when you last saw the necklace?"

Miss Heredith reflected for a moment.

"Not for some time," she said. "Violet did not care for it, and rarely wore it."

"The necklace was of pink pearls," Musard explained. "Their value was more historical than intrinsic, for they had become tarnished with age, and the setting was old-fashioned. It was for that reason Mrs. Heredith did not like it. I was going to take the pearls to London the following day to arrange to have them skinned and reset."

"When I went into poor Violet's room that night to see if she felt well enough to go to the Weynes' I asked her for the necklace," said Miss Heredith. "She replied that she would give it to me in the morning. If she had only given it to me then, she might have been alive to-day."

"I should like to hear more about this," said Colwyn. "Please tell me everything."

In response Miss Heredith related to the detective all that had pa.s.sed between the young wife and herself in the bedroom before dinner on the night of the murder. Colwyn listened attentively, with a growing sense of hidden complexities in the crime revealed at the eleventh hour. He saw that the case took on a new and deeper aspect when considered in conjunction with the facts which had been so innocently ignored. When Miss Heredith had finished, he asked her when it was first decided to send the necklace to London for resetting.

"It was the night before the murder," Miss Heredith replied. "Sir Philip suggested that Violet should wear the necklace to the dance on the following night, but Violet said that the pearls were really too dull to be worn. Mr. Musard agreed with her, and offered to take it to London and have it cleaned and reset by an expert of his acquaintance. Mr. Musard had to return to London on the morning after the dance, so that was the reason why I went into Violet's room before dinner on the night of the party to ask her for the necklace."

Colwyn considered this reply in all its bearings before he spoke.

"The best thing I can do is to return to London without delay and bring these additional facts before Scotland Yard," he said. "They have been misled-unwittingly but gravely misled-and it is only right that they should be informed at once. I know Merrington, and I will make a point of seeing him personally and telling him about the discovery of the missing necklace."

The little group heard his decision in a silence which suggested more than words were able to convey. It was Phil who finally uttered the thought which was in all their minds:

"Are you satisfied that Hazel Rath is innocent?"

"I cannot say that," responded the detective quickly. "The loss of the necklace does nothing to lessen the suspicion against her unless it can be proved that she had nothing to do with its disappearance-perhaps not even then. But all the facts must be investigated anew. The necklace must be traced, and the point about the revolver cleared up. But there is nothing more to be done here at present. The field of the investigation now shifts to London. I will get ready for the journey, if you will excuse me."

"I hope you will continue your own investigations, Mr. Colwyn," said Phil earnestly. "I am more than ever convinced of Hazel Rath's innocence, but I have small faith that the police are likely to establish it-even if they attempt to do so. I was not impressed with the skill of Detective Caldew, or his att.i.tude when I told him that I believed Hazel Rath to be innocent."

"I will continue my investigations in conjunction with Scotland Yard, if it is your wish," the detective replied.

CHAPTER XVIII

Colwyn was upstairs in his bedroom preparing for his return journey to London when a meek knock and an apologetic cough reached his ears. He turned and saw Tufnell standing at the half-open door. The face of the old butler wore a look of mingled determination and nervousness-the expression of a timid man who had braced himself to a bold course of action after much irresolute deliberation.

"I beg your pardon, sir," he said, and his trepidation was apparent in his voice. "But might I-that is to say, could you spare me a few minutes' conversation?"

"Certainly," replied the detective. "Come inside, Tufnell. What is it?"

The butler entered the room and carefully closed the door behind him.

"I am sorry to interrupt you, sir," he said. "But I have just heard Miss Heredith give orders for your car to be got ready for your return to London, and I knew there was no time to be lost. It's about the-the murder, sir." He brought out the last words with an effort.

"Go on," said Colwyn, wondering what further surprise was in store for him.