"That is it," he said.
"What?" asked Mr. Farrington, suspiciously.
"The scent I detected in your hall," replied T. B. "A peculiar scent, is it not?" He raised the bottle to his nose again. "Not your ward's by any chance?"
Farrington shook his head vigorously.
"Doris has never been in this area in her life," he said; "besides, she dislikes perfumes."
T. B. slipped the bottle in his pocket.
Further examination discovered no further clue as to the third person, and T. B. followed his host back to the study.
"What do you make of it?" asked Mr. Farrington.
T. B. did not answer immediately. He walked to the window and looked out. The little crowd which had been attracted by the shots and arrival of the police ambulance had melted away. The mist which had threatened all the evening had rolled into the square and the street lamps showed yellow through the dingy haze.