“I’m not sure that I can. But I’m positive—”

“Ah, now, Mr. Lockwood,” this from Fibsy, “you’re positive the young lady is an angel of light, because you’re head over heels in love with her. That’s all right, and I don’t blame you—but, take it from me, you’ll prove your case quicker, better and more surely, if you investigate the secret of Miss Mystery, than if you just go around babbling about her innocence and purity.”

Lockwood looked at the boy, ready to resent his impudence. But Fibsy’s serious face and honest eyes carried conviction and the secretary at once took him for an ally.

“You’re right, McGuire,” he said; “and, I for one am not afraid of the result of a thorough investigation of Miss Austin’s affairs.”

“You’ve reason to be, though,” Stone observed. “I can’t be sure, of course, but many stray hints and bits of evidence, to my mind point to Miss Austin’s close connection with the whole matter.”

“What is your theory as to the death, Mr. Stone,” Lockwood asked. “Suicide or murder?”

“Honestly, I don’t know. I’m quite ready to form an opinion when I get some real evidence. I’m through questioning Miss Austin—I shouldn’t have let her go otherwise. I want next to do a lot of further questioning. And I’d very much like to get hold of that servant, Nogi.”

“You think he’s implicated?” Lockwood stared.

“Why else would he run away? He must be found. He is probably the key to the whole situation.”

“Guilty?”