"And I don't know of any one in this town who is," cried a burly man, presumably a butcher by trade. "We are not good enough for the Bensons. They say he is even going to be mean enough to shut the gates and not let a soul inside who hasn't a ticket. And they are going to light up the grounds too!" "We can peep through the fence." "Much we will see that way. If you had said climb it--" "We can't climb it. Big John is going to be there and Tom Henshaw. They mean to keep their good times to themselves, just as they have kept every thing else. It's a queer set they are anyway, and the less we have to do with them the better." "I should like to see Hartley Benson in masquerade costume, I would." "Oh, he won't wear any of the fol-de-rol; he's too dignified." And with that there fell a sudden hush over the crowd, for which I was at a loss to account, till, upon looking up, I saw approaching on horseback, a young man in whom I had no difficulty in recognizing the subject of the last remark. Straight, slight, elegant in appearance, but with an undoubted reserve of manner apparent even at a distance, he rode up to where I stood, and casting a slight glance around, bowed almost imperceptibly, and alighted. A boy caught the bridle of his horse, and Mr. Benson, without a word or further look, passed quickly into the office, leaving a silence behind him that was not disturbed till he returned with what was evidently his noonday mail. Remounting his horse, he stopped a moment to speak to a man who had just come up, and I seized the opportunity to study his face. I did not like it. It was handsome without doubt; the features were regular, the complexion fair, the expression gentlemanly if not commanding; but I did not like it. It was too impenetrable perhaps; and to a detective anxious to probe a man for his motives, this is ever a most fatal defect. His smile was without sunshine; his glance was an inquiry, a rebuke, a sarcasm, every thing but a revelation. As he rode away he carried with him the thought of all, yet I doubt if the admiration he undoubtedly inspired, was in a single case mixed with any warmer feeling than that of pride in a fellow townsman they could not understand. "Ice," thought I; "ice in all but its transparency!" So much for Benson the son. The ball was to take place that very night; and the knowledge of this fact threw a different light over the letter I had read. The word _mask_ had no longer any special significance, neither the word _counterfeit_, and yet such was the tenor of the note itself, and such the exaggerated nature of its phrases, I could not but feel that some plot of a reprehensible if not criminal nature was in the process of formation, which, as a rising young detective engaged in a mysterious and elusive search, it behooved me to know. And moved by this consideration, I turned to a new leaf in my memorandum-book, and put down in black and white the following facts thus summarily collected: