"Are you sure," said Mr. Barnes after a pause, "that the body taken from the river was that of your brother Rufus?"
"Why do you ask that?" said Mr. Quadrant, on the defensive at once. "Can there be any doubt?"
"Before I reply, let me ask you another question. Did your brother Rufus have a scar on the sole of his foot?"
The other man started perceptibly, and paused some time before answering. Then he asked:
"What makes you think so?"
"Mr. Mark Quadrant told me that his brother had such a scar, caused by gashing his foot while in swimming."
"Ah, that is your source of information. Well, when Mark told you that his brother had met with such an accident, he told you the truth."
"But did the accident leave a scar?" Mr. Barnes thought he detected a carefully worded evasive answer.
"Yes, the cut left a bad scar; one easily noticed."
"In that case I can reply to your question. If, as you both say, your brother had a scar on the sole of his foot, then there exists considerable doubt as to the identification of the body which was at the Morgue, the body which you have both accepted and buried as being that of your relative. Mr. Quadrant, there was no scar on that body."