The detective nodded affirmatively, and Mr. Whitney examined the weapon in some perplexity.
"Well, I must say," he remarked at length, "I don't see what connection this has with the case. The shooting was done with Hugh Mainwaring's own revolver; that was settled at the inquest-"
"Pardon me! It was only 'settled' that the revolver found lying beside him was his own."
The attorney stared as Merrick continued, at the same time producing from his pocket the revolver in question, "This, as you are doubtless aware, is a Smith and Wesson, 32 calibre, while that," pointing to the rusty weapon in Mr. Whitney's hands, "is an old Colt's revolver, a 38. On the morning of the murder, after you and the coroner had gone, I found the bullet for which we had searched unsuccessfully, and from that hour to this I have known, what before I had suspected, that this dainty little weapon of Mr. Mainwaring's played no part in the shooting. Here is the bullet, you can see for yourself."
Mr. Whitney gazed in silent astonishment as the detective compared the bullet with the two weapons, showing conclusively that it could never have been discharged from the familiar 32-calibre revolver.
"Well, I'll be blessed if I can see what in the dickens that revolver of Mainwaring's had to do with the affair, anyway!"
"Very easily explained when you once take into consideration the fact that the whole thing was an elaborately arranged plan, on the part of the murderer, to give the affair an appearance of suicide. One glance at the murdered man convinced me that the wound had never been produced by the weapon lying at his side. That clue led to others, and when I left that room with you, to attend the inquest, I knew that Hugh Mainwaring had been shot with a 38-calibre revolver, in his library, near the centre of the room, and that the body had afterwards been so arranged in the tower-room as to give the appearance of his having deliberately shot himself beside his desk and with his own revolver."
"By George! I believe you're right," said the attorney; "and I recall now your statement that day, that the shooting had occurred in the library; I wondered then what reason you had for such an opinion."
"A small stain on the library carpet and the bullet told me that much. Another thing, which at first puzzled me, was the marked absence of blood-stains. There was a small pool of blood underneath the head, a slight stain on the carpet in the adjoining room, but none on the clothing or elsewhere. The solution to this I found on further investigation. The wound had been firmly and skillfully bandaged by an expert hand, the imprint of the bandage being plainly visible in the hair on the temples. Here is the proof that I was correct," and Merrick held up to the attorney's astonished view the stained and knotted handkerchief. "This, with the private keys belonging to Mr. Mainwaring's library, was in that box at the bottom of the lake. Do you consider Mrs. LaGrange or Hobson capable of planning and carrying out an affair so adroitly as that?"
"You've got me floored," the attorney answered, gazing at the proofs before him. "Hobson I know nothing about; but that woman I believe could scheme to beat the very devil himself; and yet, Merrick, when you think of it, it must have taken time—considerable time—to plan a thing like that."