“Just what I was about to ask you,” said his companion.

“Oh, time enough for that later.  You have been looking into this case, and, as you are a born detective, I naturally would like to compare notes with you.”

Mr. Whitney glanced sharply at the detective, as though suspicious of some sarcasm lurking in those words, but the serious face of the latter reassured him, and he replied,-

“Well, I’ve not had much experience in that line, but I’ve made quite a study of character, and can tell pretty correctly what a person of such and such evident characteristics will do under such and such conditions.  As I have already stated to you, I know, both from observation and from hints dropped by Hugh Mainwaring, that if ever a dangerous woman existed, — artful, designing, absolutely devoid of the first principles of truth, honor, or virtue, — that woman is Mrs. LaGrange.  I know that Mainwaring stood in fear of her to a certain extent, and that she was constantly seeking, by threats, to compel him to either marry her or secure the property to her and her son and I also know that he was anxious to have the will drawn in favor of his namesake as quickly and as secretly as possible.

“Now, knowing all these circumstances, what is more reasonable than to suppose that she, learning in some way of his intentions, would resort to desperate measures to thwart them?  Her first impulse would be to destroy the will; then to make one final effort to bring him, by threats, to her terms, and, failing in that, her fury would know no bounds.  Now, what does she do?  Sends for Hobson, the one man whom Hugh Mainwaring feared, who knew his secret and stood ready to betray it.  Between them the plot was formed.  They have another interview in the evening, to which Hobson brings one of his coadjutors, the two coming by different ways like the vile conspirators they were, and in all probability, when Hugh Mainwaring bade his guests good-night, every detail of his death was planned and ready to be carried into execution in the event of his refusing to comply with that woman’s demands made by herself, personally, and later, through Hobson.  We know, from the darkey’s testimony, that Hobson and his companion appeared in the doorway together; that the man suddenly vanished — probably concealing himself in the shrubbery — as Hobson went back into the house; that a few moments later, the latter reappeared with Mrs. LaGrange; and the darkey tells me that he, supposing all was right, slunk away in the bushes and left them standing there.  We know that the valet, going up stairs a while after, found Mrs. LaGrange in the private library, and at the same time detected the smell of burning paper.  You found the burnt fragments of the will in the grate in the tower-room.