Ambassador toward the hall.

In a few moments they reached the third floor of the house, and passed along a short hall which gave entrance to a rear extension of the building, in which the servants' quarters were located. At the entrance of the hall, a maid was seated upon a stool, reading a book. She rose as the others approached, and stood respectfully aside.

"Has anything been heard from Noël?" the Ambassador asked. "Has he asked for anything?"

"Nothing, monsieur. He has been quiet ever since six o'clock, when I took him his supper."

"What was he doing when you entered?"

"Writing, monsieur. He was sitting at the table, with a pen in his hand, and he looked up and told me to put the tray on the trunk. 'I shall ask you to take this letter to Monsieur de Grissac as soon as I have finished it,' he said. Since then I have heard nothing from him."

Duvall had preceded the Ambassador and Dufrenne to the door at the end of the short hall, and stood listening intently. In a moment, De Grissac came up, and, unlocking the door, threw it open. The room was dimly illuminated by a single candle, which smoked and guttered in its socket, apparently nearly burned out. Nothing was at first to be seen of the valet. Duvall stepped forward, then turned quickly and spoke. "Shut the door, please," he said in a tense voice.

Dufrenne did so, while the Ambassador strode forward and followed Duvall's gaze with a look of horror. On the floor beside the bed, and to the far side of the room from the door, lay the body of the unfortunate valet, his face, ghastly pale, turned toward the ceiling. But it was neither the sight of the man lying there, apparently dead, nor the agonized expression of his face, which caused both the Ambassador and Duvall to start back with exclamations of surprise. Across the man's lips was a great, dull-red blotch, which at first appeared to be a clot of blood, but which seemed, from its circular form and regular contour, more like a huge seal. And seal it was. Duvall, dropping on one knee beside the body, felt for the man's heart, at the same time looking closely at the mark upon his lips. He was quite dead, and had apparently been so for an hour or two. The blot upon his face was a great lump of red sealing wax, tightly binding together his lips, and upon it was the coarse imprint of a man's forefingers.

The Ambassador shrank back with a cry, as his eyes fell upon the ghastly sight. Dufrenne gazed at the dead man impassively. Duvall, springing to his feet, went at once to the window at the rear of the room, which stood partly open, and raising it to its full extent, looked out. The others heard him give utterance to a low whistle, as he drew back into the room.

"No one could have entered the room," cried the Ambassador, in a frightened voice. "It is thirty-five feet or more to the ground."

Duvall motioned to the window. "Look out, monsieur," he remarked, quietly.

De Grissac did so, then uttered a sudden cry. From the window to the garden below stretched a long slender wooden ladder. "It belongs to the men who have been repairing the rain spouting," he exclaimed. "They leave it in the garden, at night. I knew there was no way in which Noël could get out."

"But clearly a way, monsieur, by which others could get in," said Duvall, quietly, as he began a minute examination of the room.

"But the snuff box—do you think it has been taken away?"

"Undoubtedly, monsieur. I suspected as much, when you showed me the man's letter. Your servant, I have no doubt, took the box while shaving you this morning. You doubtless dozed off, thus giving him the opportunity. He did not know that you had taken snuff from the box this morning shortly after arising, and imagined, no doubt, that you would suppose you had lost it some time the night before. This would relieve him of any suspicion. He hurried off to his room to secrete the box, meaning to deliver it to this friend of his, Oscar Seltz, during the afternoon. His arraignment by you, his subsequent imprisonment, no doubt frightened him and filled him with remorse—hence his rather unfriendly letter to Seltz. He had repented of his bargain, and was doubtless engaged in preparing a confession, telling you of his crime, and the reasons therefor, when the murderer entered the room.

"The latter, who probably was this man Seltz, must have become alarmed by the tone of Noël's letter. He was, it seems clear, planning some trip away from London, upon which he was about to leave. He meant to take the snuff box with him. Upon receiving Noël's letter he determined to see him and demand the box, if he found the latter had secured it. No doubt he made inquiries from some of the servants, on calling to see Noël, and was informed that he was confined to his room. He then pretended to leave, but in reality, ascended to the room by means of the ladder he found in the garden, while the servants were at dinner. It was a desperate chance, but he took it. Upon arriving in the room, he found Noël engaged in preparing his confession, insisted upon reading it, then realizing that his confederate was about to play him false, killed him, after gaining possession of the box, and departed."

The Ambassador uttered a groan. "My God," he moaned, "I am lost!"

Dufrenne, who meanwhile had been making a careful examination of the dead valet's body, rose with a mystified expression upon his face. "There are no wounds upon the body at all, Monsieur Duvall," he said. "How can you account for this man's death?"

Duvall stooped, and repeated the examination which his companion had just made. "You are right," he said. "The case is a most mysterious one."

"At least we can identify the murderer by the finger print upon the seal," De Grissac remarked, eagerly.

"I'm afraid not. This man Seltz cannot be quite a fool. Look!" He held up the forefinger of the dead man's right hand, upon which was a dull red burn, with bits of the red sealing wax about the nail. "He wasn't taking any chances." He let the already stiffening arm fall, and continued his examination of the body. "The method by which the man was killed," he remarked slowly, "is not yet clear to me. Certain finger prints on the throat indicate that he might have been strangled, but they are hardly deep or extensive enough for that. I fancy they would have resulted in temporary unconsciousness only. No—there is another reason—although what it is—" He paused as his eyes lit upon a thin shining object on the floor beside the table. "Oh, this may tell us something." He picked up the thing, which the others saw at once to be a large scarf pin, and examined it carefully.

"Did this belong to your servant, Monsieur de Grissac," he asked, holding the pin up to the light.

"Yes." The Ambassador glanced at the pin carelessly. "It was one of my own that I had given him, some months ago."

Duvall laid the scarf pin carefully upon the table, then went to the body on the floor, turned it over and made a careful examination of the back of the neck. He held the candle close, pushing aside the man's thin sandy hair. Presently he rose and placed the candle on the table beside the pin. "This was what your servant was killed with, Monsieur de Grissac," he said, as he indicated the scarf pin with his finger. "It was thrust violently into the spine, at the base of the brain. Only a tiny blood spot remains to tell the tale. This fellow Seltz is a shrewd customer."

"We do not even know that it was he who committed the crime. There is no real evidence against anyone. The snuff box may still be here. I insist that you make a thorough search."

"It would be useless, monsieur," Duvall remarked with a faint smile. "The box must have been on the table when the murderer entered the room."

"Why?"

"Because otherwise he would have searched for it, and you would have found everything in disorder. Believe me, monsieur, your servant had repented of his theft, and was about to return the box to you—it was that which caused his death.