style="font-size:15px;"> The policeman's humor was infectious. Trenholme laughed, too. Realizing that the words and accent of Paris had no great vogue in Hertfordshire, he explained, and added that he possessed a copy of the song, which was at the service of the force. The man thanked him warmly, and promised to call at the inn during the afternoon.
"By the way, sir," he added, when Trenholme had passed through the wicket, "did you hear a shot fired while you was in the park?"
"Yes."
"Jer see anybody?"
"A keeper, who seemed rather annoyed about the shooting. Some one had fired a rifle."
"It sounded like that to me, sir, and it's an unusual thing at this time of the year."
"A heavy-caliber rifle must sound unusual at any time of the year in an enclosed estate near London," commented Trenholme.
"My idee exactly," said the policeman. "I think I'll go that way. I may meet Bates."
"If Bates is a bandy-legged person with suspicious eyes, a red tie, many pockets, brown leggings, and a yellow dog, you'll find him searching the wood beyond the lake, which is the direction the shot came from."
The policeman laughed.
"That's Bates, to a tick," he said. "If he was 'wanted,' your description would do for the Police Gazette."
They parted. Since Trenholme's subsequent history is bound up more closely with the policeman's movements during the next hour than with his own unhindered return to the White Horse Inn, it is well to trace the exact course of events as they presented themselves to the ken of a music-loving member of the Hertfordshire constabulary.
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.
"The man who shot Mr. Fenley."
"The man who shot Mr. Fenley!" Farrow could only repeat each word in a crescendo of amazement. Being a singer, he understood the use of a crescendo, and gave full scope to it.
"Good Heavens!" cried the doctor. "Haven't you been told? Why are you here? Mr. Fenley was shot dead on his own doorstep nearly an hour ago. At least that is the message telephoned by his son. Unfortunately I was out. Right ahead, Tom!"
The chauffeur threw in the clutch, and the car darted on again. Farrow followed, a quite alert and horrified policeman now. But it was not ordained that he should enter the house. He was distant yet a hundred yards, or more, when three men came through the doorway. They were Bates, the keeper, Tomlinson, the butler, and Mr. Hilton Fenley, elder son of the man now reported dead. All were bareheaded. The arrival of the doctor, at the instant alighting from his car, prevented them from noticing Farrow's rapid approach. When Hilton Fenley saw the doctor he threw up his hands with the gesture of one who has plumbed the depths of misery. Farrow could, and did, fit in the accompanying words quite accurately.
"Nothing can be done, Stern! My father is dead!"
The two clasped each other's hand, and Hilton Fenley staggered slightly. He was overcome with emotion. The shock of a terrible crime had taxed his self-control to its uttermost bounds. He placed a hand over his eyes and said brokenly to the butler:
"You take Dr. Stern inside, Tomlinson. I'll join you in a few minutes. I must have a breath of air, or I'll choke!"
Doctor and butler hurried into the house; then, but not until then, Hilton Fenley and the keeper became aware of Farrow, now within a few yards. At sight of him, Fenley seemed to recover his faculties; the mere possibility of taking some definite action brought a tinge of color to a pallid and somewhat sallow face.
"Ah! Here is the constable," he cried. "Go with him, Bates, and have that artist fellow arrested!"
"Meaning Mr. Trenholme, sir?" inquired the policeman, startled anew by this unexpected reference to the man he had parted from so recently.
"I don't know his name; but Bates met him in the park, near the lake, just after the shot was fired that killed my father."
"But I met him, too, sir. He didn't fire any shot. He hadn't a gun. In fact, he spoke about the shootin', and was surprised at it."
"Look here, Farrow, I am incapable of thinking
