"Now," he said, addressing them, "there is some deep mystery here. That lady must not know we are here."
"You've recognised her, sir?" asked Summers, who had on several previous occasions assisted him.
"Yes," was the novelist's hard reply. "She is here with some mysterious object. You mustn't approach The Yews till dark."
"Mr. Bailey will then be at home, sir," remarked the sergeant. "I thought you wished to explore the place before he arrived?"
Walter paused. He saw that Enid could not be on her way to visit Bailey, if he were not at home. So he suggested that Summers, whom she did not know, should go forward and watch her movements, while he and the sergeant should proceed to the house of suspicion.
Arranging to meet later, the officer from Scotland Yard lit his pipe and strolled quickly forward around the bend to follow the girl in grey, while the other two halted to allow them to get on ahead.
"Have you ever seen that lady down here before, sergeant?" asked Walter presently.
"Yes, sir. If I don't make a mistake, it is the same lady who asked me the way to The Yews soon after Mr. Bailey took the house—the lady who came with the man whom she addressed as 'Doctor'!"
"Are you quite certain of this?"
"Not quite certain. She was dressed differently, in brown—with a different hat and a veil."