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.
Indeed, it is reasonable to suppose that if chance had not brought the village constable to that identical spot, and at that very hour, the precise method of the crime might never have been revealed. Moreover, Farrow himself may climb slowly to an inspectorship, and pass into the dignified ease of a pension, without being aware of the part he played in a tragedy that morning. Of course, in his own estimation, he filled a highly important rôle as soon as the hue and cry began, but a great deal of water would flow under London Bridge before the true effect of his walk through the wood and emergence into sight in the avenue began to dawn on other minds.
His appearance there was a vital fact. It changed the trend of circumstances much as the path of a comet is deflected by encountering a heavy planet. Presumably, neither comet nor planet is aware of the disturbance. That deduction is left to the brooding eye of science.
Be that as it may, Police Constable Farrow's serenity was not disturbed until a doctor's motor car panted along the avenue from Easton and pulled up with a jerk in front of him. The doctor, frowning with anxiety, looked out, and recognition was mutual.
"Have you got the man?" he asked, and the words were jerked out rather than spoken.
"What man, sir?" inquired Farrows, saluting.