"I'll tell you the most valuable service you can render at this moment," he said. "Arrange that a constable shall mount guard at the rock till nightfall. Then place two on duty. With four men you can provide the necessary reliefs, but I want that place watched continuously, and intruders warned off till further notice. This man who happens to be here might go on duty immediately. Then you can make your plans at leisure."
Thus, by the quaint contriving of chance, Police Constable Farrow, whose stalwart form and stubborn zeal had blocked the path to the Quarry Wood since a few minutes after ten o'clock, was deputed to continue that particular duty till a comrade took his place.
His face fell when he heard that he was condemned to solitude, shut out from all the excitement of the hour, debarred even, as he imagined, from standing on the rock and watching the comings and goings at the mansion. But Winter was a kindly if far-seeing student of human nature.
"It will be a bit slow for you," he said, when the Inspector had given Farrow his orders. "But you can amuse yourself by an occasional peep at the landscape, and there is no reason why you shouldn't smoke."
Farrow saluted.
"Do you mean, sir, that I can show myself?"
"Why not? The mere fact that your presence is known will warn off priers. Remember—no one, absolutely no one except the police, is to be allowed to pass the quarry, or approach from any side within hailing distance."
"Not even from the house, sir?"
"Exactly. Mr. Fenley and Miss Manning may be told, if necessary, why you are there, and I am sure they will respect my wishes."
Farrow turned back. It was not so bad, then. These Scotland Yard fellows had chosen him for an important post, and that hint about a pipe was distinctly human. Odd thing, too, that Mr. Robert Fenley was not expected to put in an appearance, or the Superintendent would have mentioned him with the others.