"Or that you knew the revolver, and took it to save the person, man or woman, who fired the shot. I will assume, for the moment, that this is correct. Where is the revolver?"

From the adjoining room there came a slight noise, a faint breath of sound; or it might have been only an echo of silence. Their eyes were fixed each upon the others unwaveringly, with not a flicker to indicate that either had heard. After a moment Miss Thorne returned to her chair and sat down.

"It's rather a singular situation, isn't it, Mr. Grimm?" she inquired irrelevantly. "You, Mr. Grimm of the Secret Service of the United States; I, Isabel Thorne, a secret agent of Italy together here, one accusing the other of a crime, and perhaps with good reason."

"Where is the revolver?" Mr. Grimm insisted.

"If you were any one else but you! I could not afford to be frank with you and—"

"If you had been any one else but you I should have placed you under arrest when I entered the room."

She smiled, and inclined her head.

"I understand," she said pleasantly. "For the reason that you are Mr. Grimm of the Secret Service I shall tell you the truth. I did take the revolver because I knew who had fired the shot. Believe me when I tell you that that person did not act with my knowledge or consent. You do believe that? You do?" She was pleading, eager to convince him.

After a while Mr. Grimm nodded.

"The revolver is beyond your reach and shall remain so," she resumed. "According to your laws I suppose I am an accomplice. That is my misfortune. It will in no way alter my determination to keep silent. If I am arrested I can't help it." She studied his face with hopeful eyes. "Am I to be arrested?"