"A good idea!" he murmured, as he rose to his feet. "I'll watch this room to-night."

As he stood there, speculating on the possibility of the owner of the trinket returning to the room to search for it, he was interrupted by a low tap at the door. He walked across and opened it. Tufnell stood outside, grave and composed.

"Mr. Musard would like to see you in the library," he said.

His tone was even and almost deferential, but the detective's watchful eyes intercepted a fleeting glance cast by the butler over his shoulder in the direction of the still figure on the bed.

"Very well, I will see him," said the detective.

"I will take you to him, if you will come with me." The butler preceded him along the pa.s.sage with noiseless step, and Caldew followed him, deep in thought.

The butler escorted him to the library, and entered after him. Musard was in the room alone, standing by the fireplace, smoking a cigar. He looked up as Caldew entered.

"I have just learnt something which I think you ought to know," he said. "The information comes from Tufnell. He tells me that while he was going around the house this afternoon he found the outside door of the back staircase unlocked."

"Do you mean the door at the bottom of the staircase in the left wing?" asked Caldew.

"Precisely."

"I understood from Miss Heredith that this door was always kept locked."

"So it is, as a rule. It was only by chance that the butler discovered this evening that it had been unlocked. You had better explain to the detective, Tufnell, how you came to find it unfastened."

"I was going round by the back of the house this evening," said the butler, coming forward. "As I pa.s.sed the door I tried the handle. To my surprise it yielded. I opened the door, and found that the key was in the keyhole, on the other side. I locked the door, and took the key away."

"What time was this?" inquired Caldew.

"A little before six-perhaps a quarter of an hour."

"Is it your custom to try this door every night?"

"Oh, no, it is not necessary. The door is always kept locked, and the key hangs with a bunch of other unused keys in a small room near the housekeeper's apartments, where a number of odds and ends are kept."

"When was the last time you tried the door?"

The butler considered for a moment.

"I cannot rightly say," he said at length. "The door is never used, and I rarely think of it."

"Then, for all you know to the contrary, the key may have been in the door for days, or weeks past."

"Why, yes, it is possible, now that you come to mention it," said the butler, with an air of surprise, as though he had not previously considered such a contingency.

"The key had been taken off the bunch?"

"Yes."

"Do the servants know where the key is kept?"

"Some of the maidservants do. The back staircase is occasionally opened for ventilation and dusting, and the maid who does this work gets the key from the housekeeper."

"Who has charge of the room where the keys are kept?"

"n.o.body in particular. It is really a sort of a lumber-room. The housekeeper has charge of the keys."

"Thank you; that is all I wish to know."

The butler left the room, and Caldew looked up, to encounter Musard's eyes regarding him.

"Do you think this has anything to do with the murder?" Musard asked.

Caldew hesitated for a moment. It was on the tip of his tongue to reply that he attached no importance to the butler's statement, but professional habits of caution checked his natural impulsiveness.

"I want to know more about the circ.u.mstances before advancing an opinion," he replied. "Tufnell's story was rather vague."

"In what respect?"

"In regard to time. The door may have been left unlocked for days."

"Who would unlock it?" replied Musard. "The inference, in view of what has happened, seems rather that the door was unlocked to-day, and Tufnell stumbled upon the fact by a lucky chance-by Fate, if you like. At least it looks like that to me."

"And the murderer entered by the door?"

"Yes."

"I think that is a.s.suming too much," said Caldew. He had no intention of pointing out to his companion that such an a.s.sumption overlooked the fact that Tufnell's discovery, and the locking of the door, had not prevented the crime and the subsequent escape of the murderer.

He turned to leave the room, but Musard was in a talkative mood. He offered the detective a cigar, and kept him for a while, chatting discursively. Caldew was in no humour to listen. His mind was full of the problems of this strange case, and he was anxious to return upstairs. He took the first opportunity of terminating the conversation and leaving the room.

It was his intention to conceal himself in one of the wardrobes of the bedroom in the hope that the owner of the trinket he had found would return in search of it. As he reached the landing he was surprised to see that the door of the murdered woman's bedroom was wide open, although he remembered distinctly that he had closed it when he left the room to accompany the butler downstairs. With a quickly beating heart he hurried across the room to the spot where he had left the trinket. But it was gone.

CHAPTER VII

It was the morning after the murder, and five men were seated in the moat-house library. One of them attracted instant attention by reason of his overpowering personality. He was a giant in stature and build, with a ma.s.sive head, a large red face from which a pair of little bloodshot eyes stared out truculently, and a bull neck which was several shades deeper in colour than his face. He was Superintendent Merrington, a noted executive officer of New Scotland Yard, whose handling of the most important spy case tried in London during the war had brought forth from a gracious sovereign the inevitable Order of the British Empire. Merrington was known as a detective in every capital in Europe, and because of his wide knowledge of European criminals had more than once acted as the bodyguard of Royalty on continental tours, and had received from Royal hands the diamond pin which now adorned the spotted silk tie encircling his fat purple neck.

The famous detective's outlook on life was cynical and coa.r.s.e. The cynicism was the natural outcome of his profession; the coa.r.s.eness was his heritage by birth, as his sensual mouth, blubber lips, thick nose, and bull-neck attested. It was a strange freak of Fate which had made him the guardian of the morals of society and the upholder of law and order in a modern civilized community. By temperament and disposition he belonged to the full-blooded type of humanity which found its best exemplars in the early Muscovite Czars, and, if Fate had so willed it, would have revelled in similar pursuits of vice, oppression, and torture. As Fate had ironically made a police official of him, he had to content himself with letting off the superfluous steam of his tremendous temperament by oppressing the criminal cla.s.ses, and he had performed that duty so thoroughly that before he became the travelling companion of kings his name had been a terror to the underworld of London, who feared and detested his ferocity, his unscrupulous methods of dealing with them, and his wide knowledge of their cla.s.s.

He was a recognized hero of the British public, which on one occasion had presented him with a testimonial for his capture of a desperado who had been terrorizing the East End of London. But Merrington disdained such tokens of popular approval. He regarded the public, which he was paid to protect, as a pack of fools. For him, there were only two cla.s.ses of humanity-fools and rogues. The respectable portion of the population const.i.tuted the former, and criminals the latter. He had the lowest possible opinion of humanity as a whole, and his favourite expression, in professional conversation, was: "human nature being what it is...." He was still a mighty force in Scotland Yard, although he had pa.s.sed his usefulness and reached the ornamental stage of his career, rarely condescending to investigate a case personally.

His present visit to the moat-house was one of those rare occasions, and was due to the action of Captain Stanhill, the Chief Constable of Suss.e.x, who was seated near him. Captain Stanhill was a short stout man, with a round, fresh-coloured face, and short st.u.r.dy legs and arms. He wore a tweed coat of the kind known to tailors as "a sporting lounge," and his little legs were encased in knickerbockers and leather gaiters, which were spattered with mud, as though he had ridden some distance that morning. He was a very different type from Superintendent Merrington-a gentleman by birth and education, a churchman, and a county magnate. He never did anything so dangerous as to think, but accepted the traditions and rules of his race and cla.s.s as his safe guide through life. Like most Englishmen of his station of life, he was endowed with just sufficient intelligence to permit him to slide along his little groove of life with some measure of satisfaction to himself and pleasure to his neighbours. He was a sound judge of cattle and horses, but of human nature he knew nothing whatever, and his first act, on being informed of the murder at the moat-house, was to ring up Scotland Yard and request it to send down one of its most trusted officials to investigate the circ.u.mstances. In reply to this call for a.s.sistance, Superintendent Merrington, not unmindful of the county standing and influence of the Herediths, had decided to investigate the case himself, and had brought with him two satellites-a finger-print expert who was at that moment paring his own finger-nails with a pocket-knife as he stared vacantly out of the library window, and an official photographer, who was upstairs taking photographs in the death chamber.

Seated near the finger-print expert was a police official of middle-age, Inspector Weyling, of the Suss.e.x County Police. He was a saturnine sort of man, with a hooked nose, a skin like parchment, and a perfectly bald sugar-loaf head, surmounted at the top by a wen as large as a duck-egg. His deferential att.i.tude and obsequious tone whenever Superintendent Merrington chose to address a remark to him indicated that he had a proper official respect for the rank and standing of that gentleman. Inspector Weyling was merely a police official. He had no personal characteristics whatever, unless a hobby for breeding Belgian rabbits, and a profound belief that Mr. Lloyd George was the greatest statesman the world had ever seen, could be said to const.i.tute a temperament.

The fifth man was Detective Caldew, who had just completed a narrative of the events of the previous night for the benefit of his colleagues, but more especially for Superintendent Merrington, in whose hands lay the power of directing the investigations of the crime. It was by no wish of Detective Caldew that Superintendent Merrington had been brought into the case. Caldew thought when the county inspector arrived and found a Scotland Yard man at work he would be only too glad to allow him to go on with the case, and he antic.i.p.ated no difficulty in obtaining the consent of his official superiors at Scotland Yard to continuing the investigations he had commenced. But Inspector Weyling, when notified of the crime by Sergeant Lumbe, had telephoned to the Chief Constable for instructions. The latter, distrustful of the ability of the county police to bring such an atrocious murderer to Justice, had begged the help of Scotland Yard, with the result that Superintendent Merrington and his a.s.sistants appeared at the moat-house in the early morning before the astonished eyes of Caldew, who was taking a walk in the moat-house garden after a night of fruitless investigations.

In the arrival of Merrington, Caldew saw all his fine hopes of promotion dashed to the ground. He was by no means confident that Merrington would permit him to take any further share in the investigations, but he was quite certain that if he did, and the murderer was captured through their joint efforts, very little of the credit would fall to his share when such a famous detective as Merrington was connected with the case. Merrington would see to that.

Caldew, in his narration of the facts of the murder, laid emphasis on the mysterious nature of the crime, in the hope that Merrington might deem it wiser to return to London and leave him in charge of the case, rather than risk a failure which would greatly damage his own reputation. Merrington listened to him gloomily. He fully realized the difficult task ahead of the police, and his temper was not improved in consequence.