"Villain!" he shrieked, losing his self-possession in a sudden burst of fury; "spy! informer! I understand it all now. You have been set over me by my brother. Instructed by him, you have dared to enter this house, worm yourself into its secrets, and by a deviltry only equalled by your presumption, taken advantage of your position to poison my father and fling the dreadful consequences of your crime in the faces of his mourning family. It was a plot well laid; but it is foiled, sir, foiled, as you will see when I have you committed to prison to-morrow." "Mr. Benson," I returned, shaking him loose as I would a feather, "this is all very well; but in your haste and surprise you have made a slight mistake. You call me a spy; so I am; but a spy backed by the United States Government is not a man to be put lightly into prison. I am a detective, sir, connected at present with the Secret Service at Washington. My business is to ferret out crime and recognize a rogue under any disguise and in the exercise of any vile or deceptive practices." And I looked him steadily in the face. Then indeed his cheek turned livid, and the eye which had hitherto preserved its steadiness sought the floor. "A detective!" murmured Miss Carrie, shrinking back from the cringing form of the brother whom, but a few hours before, she had deemed every thing that was noble and kind. "A detective!" echoed Edith, brightening like a rose in the sunshine. "In government employ!" repeated Uncle Joe, honoring me with a stare that was almost comic in its mingled awe and surprise. "Yes," I rejoined; "if any one doubts me, I have papers with me to establish my identity. By what means I find myself in this place, a witness of Mr. Benson's death and the repository of certain family secrets, it is not necessary for me to inform you. It is enough that I am here, have been here for a good hour, posted behind that curtain; that I heard Jonas' exclamation as he withdrew from the balcony, saw Mr. Benson come in from his bedroom, drink his glass of wine, and afterward fall at the feet of his son and daughter; and that having been here, and the witness of all this, I can swear that if Mr. Benson drank poison from yonder decanter, he drank poison that was put into it before either he or the Yellow Domino entered this room. Who put it there, it is for you to determine; my duty is done for to-night." And with a bow I withdrew from the group about me and crossed to the door.