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 had caused her to take herself off altogether.

Closing the door of the room, I returned to the aperture in the wainscot, and minutely examined the head of the steps, where I saw unmistakable traces of the slippered feet which were so noticeable in the dust that covered the floor of the room. Descending the steps, which were very narrow, I reached the bottom, and found further progress barred by a door that was without handle or lock; but, after some time, I discovered a small wooden knob sunk in the woodwork at the side, and, pressing this, the door, with almost absolute noiselessness, slid back, and lo! the "Treasure Chamber" was revealed. In the face of this discovery, I no longer entertained a doubt that the thief had entered the room by means of this secret passage. And there was no one in the whole household upon whom my suspicions fixed with the exception of Ronald Odell. If my assumption that he was the thief was correct, the mystery was so far explained; and my next step was to discover why he had robbed his father, and what he had done with the property. He was so strange and peculiar that somehow I could not imagine that he had stolen the things merely for the sake of vulgar gain, my impression being that in carrying off the jewelled skull he was actuated by some extraordinary motive, quite apart from the mere question of theft, and this determined me to shadow him for a time in the hope that I should succeed in soon obtaining distinct evidence that my theory was correct.

Before leaving the house, I sought an interview with Mrs. Odell, who was anxious to know what the result was of my investigation; but I considered it advisable, in the then state of matters, to withhold from her the discovery I had made. But, as her curiosity to learn what I had been doing on the roof was very great, I informed her that my theory was at first that there was some connection between the roof and the "Treasure Chamber"; but, though I had not proved that to be correct, I nevertheless was of opinion that the purloiner of the articles resided in the house. Whereupon she very naturally asked me if I suspected any particular person. I answered her candidly that I did; but that, in the absence of anything like proof, I should not be justified in naming anyone. I assured her, however, that I would use the most strenuous efforts to obtain the proof I wanted. Before leaving her, I remarked in a casual sort of way—

"I suppose Mr. Ronald is at the head of affairs during his father's absence?"

"Well," she began, with evident reluctance to say anything against her son, "Ronald is of a very peculiar disposition. He seems to live quite within himself, as it were, and takes no interest in anything. As a matter of fact, I see very little of him, for he usually spends his evenings from home, and does not return until late. The greater part of the day he keeps to his I am sure I am quite concerned about him at times."

The confidential way in which she told me this, and the anxious expression of her face, sufficiently indicated that Ronald was a source of great trouble to her. But I refrained, from motives of delicacy, from pursuing the subject, and was about to take my departure, when she said, with great emphasis—

"I do hope, Mr. Donovan, that you will be successful in recovering the goblet; for, quite apart from its intrinsic value, my husband sets great store upon it, and his distress when he found it had been stolen was really pitiable."

I assured her that it would not be my fault if I failed, and I said that, unless the goblet had been destroyed for the sake of the jewels and the gold, I thought it was very probable that it would be recovered. I spoke thus confidently because I was convinced that I had got the key to the puzzle, and that it would be relatively easy to fit in the rest of the pieces, particularly if I could find out where Ronald Odell spent his evenings; for to me there was something singularly suggestive in his going away from home at nights. That fact was clearly a source of grief to his mother, and she had made it evident to me that she did not know where he went to, nor why he went. But it fell to my lot to solve this mystery a week later. I shadowed him to a house situated in a cul de sac in the very heart of the city of London. The houses in this place were tall, imposing looking buildings, and had once been the homes of gentry and people of position. Their day of glory, however, had passed, and they were now for the most part utilised as offices, and were occupied by solicitors, agents, &c. It was a quiet, gloomy sort of region, although it led out of one of the busiest thoroughfares of the great metro-