The Circular Study by Anna Katharine Green

At the foot of the stairs, Mr. Gryce excused himself, and calling in two or three men whom he had left outside, had the valet removed before taking Miss Butterworth back into the study. When all was quiet again, and they found an opportunity to speak, Mr. Gryce remarked:

"One very important thing has been settled by the experiment we have just made. Bartow is acquitted of participation in this crime."