"Probly all smudged anyway," he muttered, squinting closely at the knife. "But there's sure some marks on it! Gee, Mr. Stone, there's sumpum doin'!" His eyes shone and his skinny little fingers trembled with excitement of the chase.

Stone studied the gold-fringed dress. The blood stains on the flounces, though dried and brown, were unmistakable.

"Wonderful woman!" he exclaimed. "Now, we've got this dress, and what of it? She put it here, not caring whether we got it or not. She's gone for good. She'll never be taken. This proves it to my mind."

"And the knife?" I asked, thrilling with interest.

"There you are again. If Miss Van Allen put that there for us to discover, the marks on it are of no use. Perhaps some she had put there purposely. You see, I'm inclined to grant her any degree of cleverness from what I know of her ability so far. She is a witch.

She can hoodwink anybody."

"Except F. Stone, Esquire," amended Fibsy. "You p.u.s.s.ieve, Mr.

Calhoun, the far-famed detective, is already onto her coives!"

Stone looked up to smile at the boy's speech, but he returned his gaze to the golden-trimmed gown.

"Of course," he said, "it is improbable that she took this off before she left the house that night. I opine she threw a big cloak round her and rushed out to the house of some friend. Likely she found a taxicab or even commandeered some waiting private car for her flight. You know, we are dealing with no ordinary criminal. Now, if I am right, she brought this gown back here on some of her subsequent trips. As to the knife, I don't know. I see no explanation as yet. Since she stabbed her victim with another knife--why in the world hide this one up here? What say, Fibsy?"

"'Way past me. Maybe she was usin' both knives, an' the other one turned the trick, an' when she got up here she seen she had this one still in her grip, an' she slung it in this here chest to hide it. I ain't sure that's the c'reck answer, but it'll do temp'rar'ly. I say, Mr. Stone, I got an awful funny thing to ask you."

"It won't be the first funny thing you've asked me, Terence. What is it?"

"Well, it's pretty near eatin' time, an'--aw, pshaw, I jest can't dare to say it."

"Go ahead, old chap, I can't do more than annihilate you."

"Well, I wanna go to the Schuylerses to dinner."

"To dinner!"

"Yes, sir. An' not to the kitchen eats, neither. I wanta set up to their gran' table with their butlerses an' feetmen, an' be a nonnerd guest. Kin I, Mr. Stone? Say, kinni?"

Fleming Stone looked at the eager, flushed face. He knew and I did, too, that there was something back of this request. But it couldn't be anything of vital importance to our mystery.

"Oh, I understand," said Stone, suddenly. "You've taken a desperate fancy to Mrs. Schuyler and you want to further the acquaintance. But it isn't often done that way, my boy."

"Aw, now, don't kid me, Mr. Stone. Either lemme go or shut down on it, one o' the six! But it's most nessary, I do a.s.sure you."

"Maybe she won't have you. Why should those grand ladies allow a boy of your age at their dinner-table?"

"Because you ask 'em, sir." Fibsy's tone was full of a quiet dignity.

"Very well, I'll ask them," and Stone went away to the telephone.

Fibsy stood, looking raptly at the gold gown, and now and then his eyes turned toward the knife on the dressing-table. The table was covered with silver toilet implements, and save for its unfitting suggestion, the knife was unnoticeable among the other trinkets.

"It's all right," said Stone, returning. "Mrs. Schuyler sends a cordial invitation for all three of us to dine with her."

"Much obliged, I'll be there," said Fibsy, unsmilingly.

CHAPTER XVIII

FIBSY DINES OUT

That dinner at Ruth Schuyler's was memorable. And, yet, it was in no way markedly unusual. The service was perfect, as might be expected in that well-ordered household, and the guests were well behaved. Fibsy, thanks to Fleming Stone's thoughtful kindness, was arrayed in the proper dinner garb of a schoolboy, and his immaculate linen and correct jacket seemed to invest him in a mantle of politeness that sat well on his youthful buoyancy and enthusiasm.

I glanced round the table. It was a strange combination of people.

Fleming Stone was the sort of man who is at ease anywhere, and I, too, am adaptable by nature. But the Schuyler sisters were very evidently annoyed at the idea of receiving as an equal the youth whom they regarded as a mere street arab.

Fibsy had become a firm friend of Ruth's, but he couldn't seem to like the other ladies, and he with difficulty refrained from showing this.

The Misses Schuyler were impressive in their heavy and elaborate mourning, and to my mind Ruth looked far more appropriately dressed.

She wore a black and white striped chiffon, with touches of black silk, and the effect, with her pale face and fair hair was lovely. A breastknot of valley lilies added to the loveliness, and I allowed my eyes to feast on her fairness. I had thought Ruth was not what could be called a pretty woman, certainly she was not beautiful; but that night her charm appealed to me more strongly than ever, and I concluded that her air of high-bred delicacy and infinite fineness were more to be desired than mere beauty.

Fibsy, too, devoured her with his eyes, though discreetly, and when he thought he was not observed.

Fleming Stone devoted himself to the sisters; probably, I concluded, because he was in their employ, and so owed them his attention.

Ruth wore her beautiful pearls, and referred to the fact, half-apologetically, saying that Mr. Schuyler had liked always to see them on her, and she felt privileged to continue to use them, even in her mourning period.

"You like only poils--pearls, don't you, Mrs. Schuyler?"

Fibsy's slip of p.r.o.nunciation was due to his slight embarra.s.sment at his novel surroundings, but he valiantly corrected himself and ignored it.

"I like other gems," Ruth replied, "but Mr. Schuyler preferred pearls, and gave me such beauties that I have grown very fond of them."

"I remember, Ruth," said Sarah, reminiscently, "how you used to beg Randolph for sapphires and diamonds instead. You even wanted semi-precious stones--turquoises and topaz. Oh, I remember. But Randolph taught you that pearls were the best taste for a young matron and you grudgingly acquiesced."

"Oh, not grudgingly, Sarah," and Ruth flushed at the reprimand in her sister's voice.

"Yes, grudgingly. Even unwillingly. In fact, all Randolph's decisions you fought until he made you surrender. You know how you wanted gay-colored gowns until he made you see that grays and mauves were better taste."

"Never mind my peccadilloes," said Ruth, lightly. "Let's talk of something less personal."

"Let's talk about the weather," suggested Fibsy, who was not conducting himself on the seen and not heard plan. "The park is fine now. All full o' red an' gold autumn leaves. Have you noticed it, Mrs.

Schuyler?"

"Not especially," and Ruth smiled at him, in appreciation of his conversational help. "I must walk over there to-morrow."

"Yes,'m. An' why don't you go for a long motor; ride up Westchester way? The scenery's great!"

"How do you know, have you been there?"

"Not just lately, but I was last fall. Do you remember the big trees just at the turn of the road by--"