at the back of the dead man's neck-"
"Here!" Dan roughly pushed the secretary aside, becoming impatient of the scrappy way in which he detailed what had happened. "Let me go to the library for myself and see what has happened. Sir Charles can't be dead."
"It's twelve o'clock now," retorted Penn stepping aside, "and he's been dead quite three hours, as the doctor will tell you." Before the man finished his sentence, Dan, scarcely grasping the situation, so rapidly had it evolved, ran through the hall, towards the back of the spacious house, where the library was situated. He dashed into the large and luxuriously furnished room and collided with a police officer, who promptly took him by the shoulder. There were three other men in the room, who turned from the corpse at which they were looking, when they heard the noise of Halliday's abrupt entrance. The foremost man, and the one who spoke first, was short and stout and arrayed in uniform, with cold gray eyes, and a hard mouth. "What's this-what's this?" he demanded in a raucous voice. "Who are you?"
"My name is Halliday," said Dan hurriedly. "I am engaged to Miss Moon and we have just returned from the theatre to hear-to hear-" He caught sight of Moon's body seated in the desk-chair and drooping limply over the table. "Oh, it is true, then! He is dead. Good heavens! who murdered him?"
"How do you know that Sir Charles has been murdered?" asked the officer sternly. "Mr. Penn, the secretary, told me just now in the hall," said Dan, shaking himself free of the policeman. "He blurted it out like a fool, and Miss Moon has fainted. Mrs. Bolstreath has taken her upstairs. But how did it come about? Who found the body, and-"
"I found the body," interrupted one of the other men, who was tall and calm-faced, with a bald head and a heavy iron-gray moustache, perfectly clothed in fashionable evening-dress, and somewhat imperious in his manner of speaking. "I had an appointment with Sir Charles at nine o'clock and came here to find him, as you now see him" – he waved his hand toward the desk-"the doctor will tell you how he died."
"By poison," said the third man, who was dark, young, unobtrusive and retiring in manner. "You see this deep scratch on the back of the neck. In that way the poison was administered. I take it that Sir Charles was bending over his desk and the person who committed the crime scratched him with some very sharp instrument impregnated with poison."
"Mrs. Brown!" gasped Dan, staring at the heavy, swollen body of his late guardian, whom he had dined with in perfect health. The three men glanced at one another as he said the name, and even the policeman on guard at the door looked interested. The individual in uniform spoke with his cold eyes on Dan's agitated face. "What do you know of Mrs. Brown, Mr. Halliday?" he demanded abruptly. "Don't you know that a woman of that name called here?"
"Yes. The secretary, Mr. Penn, told us that Miss Moon induced her father to see a certain Mrs. Brown, who claimed that her son had been drowned while working on one of the steamers owned by Sir Charles. You saw her also, I believe?"
"I was in the hall when Miss Moon went to induce her father to see the poor woman. That was about a quarter-past eight o'clock."
"And Mrs. Brown-as we have found from inquiry-left the house at a quarter to nine. Do you think she is guilty?"
"I can't say. Didn't the footman see the body-that is if Mrs. Brown committed the crime-when he came to show her out? Sir Charles would naturally ring his bell when the interview was over, and the footman would come to conduct her to the door."
"Sir Charles never rang his bell!" said the officer, drily. "Mrs. Brown passed through the entrance hall at a quarter to nine o'clock, and mentioned to the footman-quite unnecessarily, I think-that Sir Charles had given her money. He let her out of the house. Naturally, the footman not hearing any bell did not enter this room, nor-so far as any one else is concerned-did a single person. Only when Mr. Durwin-"
"I came at nine o'clock," interrupted the baldheaded man imperiously, "to keep my appointment. The footman told Mr. Penn, who took me to Sir Charles. He knocked but there was no answer, so he opened the door and we saw this." He again waved his hands towards the body. "Does Mr. Penn know nothing?" asked Halliday, doubtfully. "No," answered the other. "Inspector Tenson has questioned him carefully in my presence. Mr. Penn says that he brought Sir Charles his spectacles from the dining-room before you left for the theatre with the two ladies, and then was sent to his own room by his employer to write the usual letters. He remained there until nine o'clock when he was called out to receive me, and we know that Mr. Penn speaks truly, for the typewriting girl who was typing Sir Charles's letters to Mr. Penn's dictation, says that he did not leave the room all the time. "May I look at the body?" asked Dan approaching the desk, and, on receiving an affirmative reply from Durwin, bent over the dead. The corpse was much swollen, the face indeed being greatly bloated, while the deep scratch on the nape of the neck looked venomous and angry. Yet it was a slight wound to bring about so great a catastrophe, and the poison must have been very deadly and swift; deadly because apparently Sir Charles had no time to move before it did its work, and swift because he could not even have called for assistance, which he surely would have done had he been able to keep his senses. Dan mentioned this to the watchful doctor, who nodded. "I can't say for certain," he remarked cautiously, "but I fancy that snake-poison has been used. That will be seen to, when the post-mortem is made."
"And this fly?" Halliday pointed to an insect which was just behind the left ear of the dead man. "Fly!" echoed Inspector Tenson in surprise, and hastily advancing to look. "A fly in November. Impossible! Yet it is a fly, and dead. If not," he swept the neck of the corpse with his curved hand, "it would get away. H'm! Now I wonder what this means? Get me a magnifying glass." There was not much difficulty in procuring one, as such an article lay on the desk itself, being used, no doubt, by Sir Charles to aid his failing sight when he examined important documents. Tenson inspected the fly and removed it-took it to a near electric light and examined it. Then he came back and examined the place behind the left ear whence he had removed it. "It's been gummed on," he declared in surprise-a surprise which was also visible in the faces of the other men; "you can see the glistening spot on the skin, and the fly's legs are sticky." He balanced the fly on his little finger as he spoke. "I am sure they are sticky, although it is hard to say with such a small insect. However," he carefully put away the fly in a silver matchbox, "we'll have this examined under a more powerful glass. You are all witnesses, gentlemen, that a fly was found near the wound which caused Sir Charles Moon's death."
"And the scent? What about the scent?" Dan sniffed as he spoke and then bent his nose to the dead man. "It seems to come from his clothes."
"Scent!" echoed Durwin sharply and sniffed. "Yes, I observed that scent. But I did not take any notice of it."
"Nor did I," said the doctor. "I noticed it also."
"And I," followed on the Inspector, "and why should we take notice of it, Mr. Halliday? Many men use scent."
"Sir Charles never did," said Dan emphatically, "he hated scents of all kinds even when women used them. He certainly would never have used them himself. I'll swear to that."
"Then this scent assumes importance." Durwin sniffed again, and held his aquiline nose high. "It is fainter now. But I smelt it very strongly when I first came in and looked at the body. A strange perfume it is." The three men tried to realize the peculiar odor of the scent, and became aware that it was rich and heavy and sickly, and somewhat drowsy in its suggestion. "A kind of thing to render a man sleepy," said Dan, musingly. "Or insensible," said Inspector Tenson hastily, and put his nose to the dead man's chin and mouth. He shook his head as he straightened himself. "I fancied from your observation, Mr. Halliday, that the scent might have been used as a kind of chloroform, but there's no smell about the face. It comes from the clothes," he sniffed again, "yes, it certainly comes from the clothes. Did you smell this scent on Mrs. Brown?" he demanded suddenly. "No, I did not," admitted Halliday promptly, "otherwise I should certainly have noted it. I have a keen sense of smell. Mrs. Bolstreath and Lil-I mean Miss Moon-might have
