Police Constable Farrow did not hurry. Why should he? A gunshot in a gentleman's park at half past nine on a June morning might be, as he had put it, "unusual," but it was obviously a matter capable of the simplest explanation. Such a sound heard at midnight would be sinister, ominous, replete with those elements of mystery and dread which cause even a policeman's heart to beat faster than the regulation pace. Under the conditions, when he met Bates, he would probably be told that Jenkins, underkeeper and Territorial lance corporal, had resolved to end the vicious career of a hoodie crow, and had not scrupled to reach the wily robber with a bullet. So Police Constable Farrow took fifteen minutes to cover the ground which Trenholme's longer stride had traversed in ten. Allow another fifteen for the artist's packing of his sketching materials, his conversation with gamekeeper and policeman, and the leisurely progress of the latter through the wood, and it will be found that Farrow reached the long straight avenue leading from the lodge at Easton to the main entrance of the house about forty minutes after the firing of the shot. He halted on the grass by the side of the well-kept drive, and looked at the waiting motor car. The chauffeur was not visible. He had seen neither Bates nor Jenkins. His passing among the trees had not disturbed even a pheasant, though the estate was alive with game. The door of The Towers was open, but no stately manservant was stationed there. A yellow dog sat in the sunshine. Farrow and the dog exchanged long-range glances: the policeman consulted his watch, bit his chin strap, and dug his thumbs into his belt. "Mr. Fenley is late today," he said to himself. "He catches the nine forty-five. As a rule, he's as reliable as Greenwich. I'll wait here till he passes, an' then call round an' see Smith." Now, Smith was the head gardener; evidently Police Constable Farrow was not only well acquainted with the various inmates of the mansion, but could have prepared a list of the out-door employees as well. He stood there, calm and impassive as Fate, and, without knowing it, represented Fate in her most inexorable mood; for had he betaken himself elsewhere, the shrewdest brains of Scotland Yard might have been defeated by the enigma they were asked to solve before Mortimer Fenley's murderer was discovered.