We remained standing while we thought over the matter. There was a satisfied air about the detective that I could not quite fathom, and Dr.

Moore seemed to be quite pleased also.

"Well, what is it?" I asked.

With a voice that betrayed traces of elation, Oakes answered me: "The man in the cellar wore this robe; if he thumbed this paper, the murder of Smith interested him. The murder of Mark was similar, and I believe our Mansion affair is going to involve us in a peck of unexpected trouble. The clues are showing now, and we must know more about the Smith murder, as well as the Mark affair."

"Yes," put in Moore, "and all about the suspected motives in the Smith affair."

Oakes smiled. "Don't be too previous, my boy. If Hallen looks for our help, well and good. Otherwise, remember, I have given my word not to interfere with his search at present. Meanwhile, we must get into town and look around."

"You must remain here," said Moore. "You cannot go out until that wound begins to heal--in a day or so."

"That is so," said Oakes. "But perhaps Stone can find out what is going on."

So it was arranged that I should call on Chief Hallen that evening and spend a few hours in Mona.

At supper, Oakes said that tomorrow he would have men from the city who would make a complete search of the walls, and perhaps tear down some part.i.tions. "Masons, and other workmen, you know," said he; and I saw a twinkle in his eyes and realized that he was going to surround himself with men, in case of an emergency.

"Are you expecting trouble?" I asked.

"No," said he, grave again in a second, "but I believe in being forearmed. This matter is capable of developing into a very serious affair for all hands, especially if we have a band of conspirators against us."

"_A band!_" said I.

"Yes, certainly. Has it never occurred to you that there may be several desperate characters in this affair and the murder? This is no boy's play; we are facing unknown dangers. Now, Stone, go about town carefully, and send this cipher to New York first thing. When you come back, tell Chief Hallen that I want you escorted to the Mansion by two men. Remember! He will understand, for he spoke to me of the advisability of giving me aid."

It all seemed strange to me, but I was not fearful when I left just at seven for the town.

I took the short cut over the bridge, and up the hill beyond, and they watched me as I crossed the rolling plains to Mona.

It was a clear night, and I could see well over the hills, the three-quarters moon giving me excellent light. I could not help thinking how careful was this man Oakes, and what a peculiar nature was his; alert, severe even to austerity at times; then solicitous, friendly and even fond of a joke. I was more than glad that I came, although I realized that perhaps it was foolish to interfere in such affairs. Of course, that murder of Mark had been cast upon our notice by curious circ.u.mstances, and unexpectedly.

As I walked over the rolling ground, I kept my eyes well upon my surroundings; but not a living thing did I see except myself and the night birds until I entered the town.

There was an air of subdued excitement about the place. As I walked to the post-office to send my despatches the loungers seemed numerous, and some were amiss in their greetings; others, whom I knew, approached in an affable manner enough, but there seemed no genuine friendliness.

The telegraph manager took the cipher and smiled when he saw it. Then he said to me in a whisper: "Tell Mr. Clark there is trouble coming."

To my look of surprise he answered: "Oh, that's all right; I had a visit from your friend before he went to the Mansion."

Again I recognized the work of careful Oakes, and understood why he did not hesitate to send the cipher--a thing unusual in a small town.

The indications of impending trouble in town were quite impressed upon me. The little hotel was the centre of a lounging crowd, large, and composed of representative men as well as the usual hangers-on. There were evidences of much interest around the police building also--much more than would occur under normal circ.u.mstances in a town of this size, and even more than was present the night before.

I noticed a couple of brawls, and considerable raising of voices; many men were walking about as though watching the others. The prairie fire had been lighted; the sparks were burning near the roots of the gra.s.s; the air was uneasy--ready to rush in as wind, to fan and feed the first flame.

I visited the Chief, who was with his subordinates. He invited me into the private room, and then said:

"Mr. Stone, I am doing all I can to detect this murderer and to satisfy the public demand for his apprehension, but the clues are practically worthless. The populace is uneasy and suspicious."

Then he detailed to me all that he knew. I then told him how the people's actions had impressed me.

"I am going to have all I can do to keep order. I am going to ask your friend Oakes to take a hand."

"He will do it," I said, "for he is greatly interested."

"It is for the welfare of the town which I serve that I ask him to join me in this matter. Go to him, and tell him I shall see him in the morning if possible."

I was glad that affairs were taking such a turn, for I knew the facts in our possession, and that Oakes's counsel would be valuable.

I then requested an escort of two men to accompany me on my return to the Mansion, as Oakes had suggested.

"Certainly! I had no intention of letting you go back alone," he said; and then he summoned two of his men clad in citizen's clothes and introduced them to me. "Now take a walk to the outskirts, and return the same way by which you came. My men will follow you at a short distance."

Before I left I noticed my companions--fine-looking fellows both of them--and saw the tell-tale pouching of the hip pockets, and knew that we were all well armed.

"In order not to attract attention, we will walk some distance behind you. We will keep you within sight and hearing. If we fire a shot, return to us."

I started across the rolling country, and saw the two figures behind me.

Why were they so careful? Why did they not accompany me? They separated, and we advanced, I myself following the narrow path.

The night was still. I halted occasionally and looked back--a dim figure would halt on my left and on my right. It was lonesome, but I felt I had company.

I neared the slope to the pond, and looked down; there was nothing visible, and I began to descend with an easy stride. Although nearing the Mansion, I felt an unaccountable dread. This was the trying part of the journey, and my followers were now invisible to me, being on the plain above the crest of the hill. I gripped my revolver firmly, and stepped rapidly on to the bridge; but as I did so I heard a pistol shot from above, and knew instantly that I was in danger--that my companions had signalled me to return.

I faced about, and commenced my ascent of the hill.

From somewhere near a voice came to me clearly. "Run for your life," it said.

I could see nothing, but retreated hurriedly, and was soon with the others at the top of the hill.

"Why did you tell me to run?" I panted.

They looked at me. "We said nothing," was the answer; "we merely signalled you to come back."

"Well, someone ordered me to run for my life."

"Ah!" said they. "We thought we heard a voice. We saw a figure at the other side of the pond. We came over the crest cautiously, and he did not expect us. He was crossing in range of the light from the Mansion gate when we detected him. So much for following you!"

"Well, but who spoke to me? He could not have done so; his voice would not have sounded so near."

"No, evidently someone near you was watching him; he was about to waylay you, and the watcher knew it and warned you."

We heard a commotion and saw a figure dash from the bridge, away toward the north end of the pond, and disappear.

Then another figure showed at the crest on the River Road and followed him at breakneck speed.

"See--the man on the bridge was the fellow who warned you. The other is after him. He won't catch him, however."