A parting wave of the hand and the ranch was left behind, and Allen was off on a journey that was to be filled with adventures and excitement from start to finish.

Chet and Paul watched the horse and his two riders out of sight, and then with rather heavy hearts returned to the house. The place seemed more lonely than ever with both Allen and Noel Urner gone.

"It's going to be a long time waiting for Allen's return," sighed Paul.

"Perhaps not," returned Chet. "He left me with a secret to tell you, Paul."

And Chet lost no time in relating Allen's story of the hidden mine of great wealth.

"And perhaps we can explore the place during his absence," Paul said, after he had expressed his astonishment and asked half a dozen questions.

"I don't know about that, Paul. We may not be able to find the opening Allen mentioned, and then, again, he may not wish us to do so."

"Why should he object?"

"I don't know."

"We'll have ten days or two weeks on our hands, at the very least. We might as well take a look at that wealth as not."

"Supposing somebody followed us and found out the secret? They would locate a claim before we could turn a hand."

"We will make sure that we are not followed," said Paul, who was anxious to see if all Allen had told could really be true.

Chet continued to demur, but after Allen and Noel had been gone the whole of the next day he gave in, and seemed as anxious as Paul to do something which would make it less lonely. Apparently the horse thieves had left the vicinity, so there was nothing to be feared in that direction during an absence that they meant should not last more than one whole day.

Sunday came between, and on Monday morning they arose early and had breakfast ere it was yet daylight. They decided to take Rush, both to ride when on a level and each to take a turn at walking when on the uphill trails.

Allen had left Chet minute directions as to how the opening to the hidden mine could be located, he having fixed the locality well in his mind before leaving it.

It was rather a gloomy day, but this the two boys did not mind.

"It's better than being so raging hot," said Paul. "It makes my head ache to ride when it's so fearfully hot."

"If it only don't rain," returned Chet. "We need it bad enough, goodness knows, but it has held off so long it might as well hold off twenty-four hours longer."

"I doubt if we get rain just yet. It hasn't threatened long enough," replied his brother.

Before the two left the ranch they saw to it that every building was locked up tight, and an alarm, in the shape of a loaded gun, set to the doors and windows.

"That ought to scare would-be thieves away," said Chet. "They'll imagine somebody is firing at them."

The rest for a couple of days had done Rush much good, and he made no work of carrying the two boys along the trail that led to the second foothills.

Long before noon they reached the hills, and here stopped for lunch.

"And now for the wonderful mine!" cried Chet. Then, happening to glance across the plains below, he added: "Gracious, Paul! What is that?"

The attention of both young ranchmen was at once drawn to a round, black cloud on the horizon to the east. It was hardly a yard in diameter, apparently, when first seen, but it increased in size with great rapidity.

It was moving directly toward them, and in less than two minutes from the time Chet uttered his cry it had covered fully a third of the distance.

"From what I have heard I should say that was a cyclone cloud," exclaimed Paul. "And still – "

"Who ever heard of a cyclone up here among the foothills," returned Chet. "I don't believe they ever strike this territory."

"I certainly never heard of their doing so," returned Paul. "But still, you must remember, that cyclones are erratic things at the best."

"It looks as if it were coming directly this way."

"So it does, and I reckon the best thing we can do is to make tracks for some place of safety."

"That is true. Come on!"

Both boys sprang into the saddle and started up the trail. Hardly had a hundred feet of the way been covered than a strange rush and roar of wind filled the air.

"It's coming," shouted Paul. "Quick, Chet, down into that hollow before it strikes us!"

He plunged into the basin he had designated, which was six or eight feet below the level of the trail and not over ten yards in diameter. Chet followed, ducking low as he did so, for already was the air filled with flying branches.

"None too soon!" ejaculated Paul. "Down, Rush!"

Between them they managed to get the horse to lie down close to a wall of dirt and rocks. They lay near, waiting almost breathlessly for that awful time of peril to pass.

No one who has not experienced the dreadful effects of a cyclone can imagine it, be the description of it ever so fine. That strange rush and roar, that density of the air, accompanied by a feeling as if the very breath was about to be drawn from one's lungs, the flying débris, all unite to chill the stoutest heart and make one wonder if the next moment will not be the last.

The cyclone was short and sharp. From the time it first struck the foothills until the time it spent itself in the distance was barely four minutes, yet, what an effect did it leave behind!

On all sides of them many trees were literally torn up by the roots, brush was leveled as if cut by a mowing machine, and dirt and pebbles which had been perhaps carried for miles were deposited here, there, and everywhere. Ranch boys though they were, and accustomed to many things strange and wonderful, Chet and Paul could only gaze at the work of destruction in awe, and silently thank heaven that their lives had been spared.

They had escaped with slight injury. Several sharp sticks and stones had scratched Chet's neck as he lay prostrate, and Paul's arm was greatly lamed by a blow from the branch of a tree which fell directly across the opening, pinning the horse down in such a fashion that he could not rise.

"We must liberate Rush first of all," cried Chet. "Poor fellow! Whoa, Rush, we'll soon help you," he added, and patted the animal on the neck to soothe him.

Evidently Rush understood, for he lay quiet. Then Chet and Paul, using all of their strength, raised up one end of the tree, which, fortunately, was not large. As soon as he felt himself free, Rush scrambled up out of harm's way, and they let the tree fall back again.

"That is the kind of an adventure I never want to experience again," said Paul when he had somewhat recovered his breath. "My, how the wind did tear things!"

"It was a full-fledged cyclone and no mistake," returned his brother. "Had that struck a town it would have razed every building in it."

"That's true, and oh!" went on Paul suddenly, "I wonder if it has destroyed the marks Allen left whereby the mine is to be found?"

Chet stared at him speechless.

"Perhaps!" he gasped at last. "Come, let us go on and see!"

There was considerable difficulty in getting out of the hollow into which they had so unceremoniously thrust themselves. Rush was somewhat frightened still, and instead of riding him, they led him out by a circuitous way which took them nearly a hundred yards out of their path.

They found the trail almost impassable in spots, and more than once were compelled to make a wide detour in order to avoid fallen trees and gathered brush.

"A cyclone like that can do more damage than can be repaired in ten years," observed Chet as they labored along on foot. "I wonder where it started from?"

"Somewhere out on the flat lands near the river, I reckon," returned Paul.

On they went around trees and rocks and brush, until the way grew so bad that both came to an involuntary halt.

"It looks as if the very trail had been swept away," said Paul. "I can't see anything of it ahead."

"Nor I. Whoever would have thought of such a thing when we left home?"

"We can't go on in this direction, that's sure. What's best to be done?"

Both looked around for several minutes and then decided to cross a rocky stretch to the right. They had to do this with great care, as the road was full of sink holes and crevices, and they did not want to break a leg or have the horse injured.

The stretch crossed, they found themselves on a little hill. All about them could be seen the effects of the cyclone, not a tree or bush had escaped its ravages.

"It looks as if the landmarks Allen had mentioned had been swept away," said Paul, as he gazed around hopelessly. "I can't see the first of them."

"It would certainly seem so," rejoined Chet. "If they are, they won't be able to locate the mine again, excepting to sail down the underground river."

"That is so – excepting Uncle Barnaby turns up with another and better way of locating it," replied Paul very seriously.

CHAPTER XIV.
Another Surprise

The desolation on all sides of them and the failure to locate the marks Allen had mentioned caused Paul and Chet to become much downcast. They had had their long and tedious journey from the ranch home for nothing.

"I suppose there isn't anything to do but to go back," remarked Chet dismally, as he thrashed around in the brush with a stick he had picked up. "We are as far away from the mine as we were when we started."

"Let us be in no hurry to return," rejoined Paul. "We'll give Rush a chance to get back his wind."

Leaving the trusty animal to roam about as pleased him, the two boys threw themselves on the grass and gave themselves up to their reflections.

"I'll tell you what I would like to do," remarked Chet. "I would like to find the chap who cleaned us out of that seven hundred dollars."

"I wonder that Allen didn't get Watson to stop the horse thieves and search them," mused Paul. "He must have known they had the money."

"He was too played out to think of much just then, I reckon. It was a good deal to escape with the horses without getting shot."

"The cross we found in the barn belonged to that Saul Mangle beyond a doubt. The initials prove that."

"I believe you."

"We must watch out for that Mangle, and if we can ever get our hands on him, make him give up our money and then have him locked up."

"It is not so easy to lock up a man when you are miles and miles away from a jail."

An hour went by, and the boys thought it time to start on the return. Rush was called back from a thicket into which he had wandered and both mounted, for the trail now lead almost entirely down hill.

After the cyclone the sun had come out strong and hot, and halfway back to the ranch the brothers were glad enough to stop beside the bank of a tiny mountain stream and obtain a drink and water the horse.

They were about to depart when Rush pricked up his ears and gave a peculiar whinny.

"Hush! What does that mean?" Paul asked in quick alarm.

"Draw behind the brush and see," replied Chet, cautiously. "Those horse thieves may be still in the vicinity."

"Oh, they would not remain here," said Paul.

Yet he followed his brother behind the brush. They tried to make Rush come, too, but for once the animal would not obey.

"Come, Rush, come," whispered Chet. "Why he never acted this way before."

"The cyclone upset his mind, I reckon," said Paul, with a faint show of humor. "Make him come."

But the more Chet tried the more obstinate did the animal become. Finally he broke away altogether and ran off, kicking up his heels behind him.

"Well, I never!" gasped Chet.

"Quick, after him! I believe he means to run away!" cried Paul.

"Rush run away!" said Chet reproachfully. It hurt him a good deal to have Paul speak in that fashion of the horse he so loved.

Both boys leaped from the thicket and after Rush, who was now running up the bank of the stream at top speed. A turn was made and the brothers burst out into a loud and joyous shout.

There, not fifty feet away, was Lilly, the faithful mare Allen had fancied was drowned in the Black Rock River. Rush stood beside her, licking her neck affectionately.

"Allen's horse!" cried Chet.

"And as well as ever almost," added Paul, as he rushed up and began an examination.

The mare was evidently glad to see both the boys and her mate. She stood trembling as Chet and Paul examined her.

"A few slight bruises, that is all," said Paul. "Won't Allen be glad when he hears of it?"

"Indeed he will be. He loves Lilly as if she was his best girl. It's a good thing for us, too, Paul," he went on. "Now each can have a mount home."

"Right you are – if Lilly can carry me."

Paul was speedily on the mare's back. She seemed willing enough to carry him; in fact, glad to be in the keeping of a human being she knew.

"If she could only talk what a tale she would have to tell," observed Paul as they rode homeward. "I wonder how she got out of the river?"

"I reckon we'll never know, unless Allen makes her talk. He can make her do most everything," laughed Chet.

On they went over the rocks and the level prairie beyond. The sun was now sinking in the west, and ere long the evening shadows would be upon them.

"Well, we found a horse even if we didn't find a mine, and that's something," said Paul, as they reached the trail beside the river.

"But I hope that the mine isn't lost for good," replied Chet, quickly. "The mine is worth a good deal more than even Lilly."

"Maybe you can't tell that to Allen."

"Oh, yes I can; for he saw the wealth there, you know."

"If only he finds Uncle Barnaby," sighed Paul. "Do you know, the more I think of it, the more I become convinced that something dreadful has happened to him."

"And that is the way I look at it, too, Paul. If we could – "

Chet stopped short and stared ahead. They had come in sight of the semi-stockade around their ranch house.

"Our furniture and trunks!" gasped Paul, following the direction of Chet's stare. "What on earth does it mean?"

There on the grass lay their furniture in a confused mass – tables, chairs, trunks, clothing, one on top of another. And in another heap were the farming implements from the barn.

"Captain Grady's dirty work!" cried Paul. "He has come here and taken possession during our absence."

Paul was right, for at that moment Captain Grady appeared at the stockade gate, gun in hand.

The sarcastic smile on the captain's face told plainly that he rather enjoyed the situation. He gazed at the boys without saying a word.

His left hand was tied up in a bandage, showing that he had not entirely escaped the gun traps which had been set. As a matter of fact, half a dozen bird shot still remained in the fleshy part of his thumb.

"What does this mean?" demanded Paul at length. He spoke as calmly as he could, although tremendously excited.

"Reckon you have eyes an' can see," growled Captain Grady. "I told you that you hadn't seen the end of this, an' that I would have this place in my possession putty quick."

"You had no right to break into our house and fire our things out!" cried Chet.

"I deny as how it's your house, youngster. It belongs to me, as does the whole ranch property. There be your traps, an' the quicker you git them off this ground the better it will suit me."

"We won't move a thing until we put them back into that house," retorted Chet hot-headedly. "This is no way to gain possession, and you know it."

"Halt where you are!" Captain Grady raised his gun and pointed it at Chet, who was in advance. "You'll not come near this gate, mind that!"

"I'm going in, and you won't stop me," retorted Chet.

"Don't be rash, Chet," whispered Paul, riding up and plucking his younger brother by the sleeve.

"You try and cross this gateway and I'll fire on you, sure as fate," went on the captain.

Urged by Paul, Chet brought Rush to a stand. The boys were about thirty feet from where Captain Grady stood on guard.

"Now, the best thing you fellers can do," said the captain, sharply, "is to ride over to Dottery's ranch, an' git a wagon an' tote these traps away. If they are left more 'n a week I'll pitch them into the river, mind you. If you ain't satisfied at the way matters have turned, you can go to law, just as you advised me to do," and again the man smiled sarcastically.

"We certainly will go to law," replied Paul. "Are you alone here?"

"That's not for you to ask."

"I presume you hung around here and saw my brother go off first and then waited for us to go away."

"I ain't standing here as a target for questions," growled Captain Grady.

"You are a sneak and worse, Captain Grady!" burst out Chet. "If there is any law in Idaho you shall have your full dose of it, mark my word!"

"Hi! you young bantam, don't talk to me in that fashion," roared the man in a rage. "Come, I've told you what is best to do. Now clear out. I shall keep watch, an' if you attempt to play any trick in the dark on me you'll find yourself running up against a charge of buckshot."

That Captain Grady was in dead earnest was very evident. He scowled viciously and walked a step forward.

Yet the boys were not daunted. They held their ground, and Paul even took a slight move forward on Lilly's back.

"Supposing we go to Dottery's ranch," said the youth. "If we tell our story, don't you imagine Dottery will turn in and help us bounce you out of here?"

"No, you'll get no help at Dottery's."

"He is our friend, and he will not stand up for your doings, even if you do own the ranch over the river."

"Well, why don't you go an' see Dottery," snapped Captain Grady.

"We will – and some other people, too," cried Chet.

"And in the meantime, if any of our stuff is lost, you'll pay for it," added Paul.

"I won't be responsible for anything. Now clear out an' leave me alone."

The two brothers looked at each other. Neither knew exactly what to do. Paul finally made a sign to withdraw, and they turned and rode down the river trail to the belt of cottonwoods.

Captain Grady remained at the gateway, his baneful eyes on them until the trees hid them from view. Then he shut the heavy gate and walked slowly toward the house, rubbing his grizzled chin reflectively.

"They won't come back to-night, I'm pretty certain of that," he said to himself. "An' by to-morrow I'll be better fixed to hold my own."

CHAPTER XV.
At Dottery's Ranch

"It's a shame, Paul!" ejaculated Chet, almost crying with rage. "We ought to have shot him where he stood."

"I suppose many a man would have done it," returned Paul, somewhat moodily. "But we must get him out."

"He won't go out without a fight."

"I think he will – when we get enough of a crowd against him. I more than half believe he is totally alone, although the furniture and other stuff look as if he had had somebody to help him."

"He's been hanging around watching his chance," went on Chet. "Who knows but what he has been spying on us ever since his last visit."

"Oh, I trust not, Chet!" Paul looked much disturbed. "He may have overheard some of our talk about Uncle Barnaby's mine, you know."

"That's so! What if he did! He is rascal enough to try to locate it and set up a claim, eh?"

"Undoubtedly. Come on; the best we can do is to ride to Dottery's and try to obtain help. It's a long journey by night, but there's nothing else to do."

"I won't mind it – if only Dottery will turn in and help us. He ought to, but he always was a peculiar fellow. He may not want to make an enemy of Captain Grady, seeing as the ranches adjoin. But come on, while daylight lasts."

And off the two brothers struck, along the river trail, and then down the road Allen and Noel Urner had pursued on their way to the far-away railroad station. They realized that in another hour darkness would be upon them.

The boys knew the way well, having traveled it a dozen times in search of stray cattle. They rode on, side by side, urging on the tired horses and discussing the situation in all its various phases.

Slowly the sun faded from view behind the distant mountains, casting long shadows over the foothills and the level stretches beyond. The night birds sang their parting song, and then came the almost utter silence of the night.

"When do you suppose we'll reach Dottery's?" questioned Chet, after several miles had been covered.

"If all goes well, we'll get there by one or two o'clock," returned his brother. "You must remember we have Demon Hollow to cross, and that's no fool of a job in the dark."

"Especially if the Demon is abroad," laughed Chet. He was only joking, and did not believe in the old trappers' stories about the ghost in hiding at the bottom of the rocky pass.

When darkness fell the hoofstrokes of the horses sounded out doubly loud on the semi-stony road. Yet, to the boys, even this was better than that intense stillness, which made one feel, as Chet expressed it, "a hundred miles from nowhere at all."

So tired were the horses that the boys had their hands full making them keep their gait. They would trot a few steps and then drop into a stolid walk.

"I don't blame them much," said Chet, sympathetically. "It's doing two days' work in one. But never mind, they shall have a good rest when it's all over."

By ten o'clock it was pitch dark. To be sure the stars were shining, but they gave forth but a feeble light. The boys had to hold their animals at a tight rein to keep them from stumbling into unexpected holes.

"It will be nearer three o'clock than two before we get there at this rate," grumbled Paul. "Just look ahead and see how dark and forbidding the Hollow looks."

"Not the most cheerful spot in the world truly," rejoined Chet, as he strained his eyes to pierce the heavy shadows. "Let us get past it as soon as we can."

"Afraid, Chet?"

"Oh, no, only I – I would rather be on the level trail beyond the pass."

Paul said no more, having no desire to hurt his younger brother's feelings. To tell the exact truth, he himself felt a bit "off." It was growing toward midnight.

Down and down led the road, between two rocky crags. Soon the last trace of light was left behind, and they had to let the horses pick their own way as best they might.

Suddenly Chet gave a start and a cry.

"O, Paul, what is that?"

"Where?"

"Over to the left."

Paul turned in his saddle. As he did so an object not over two feet in length and of a gray and white color, with some black, swept to one side of them.

"Can it be a pig?" gasped Chet.

"A pig? No, it's a badger, out on the forage. Don't you smell him?"

Chet recovered and unslung his gun. He tried to take aim in the gloom.

"Don't fire!" said Paul. "What is the use? It's only a waste of ammunition. The badger isn't hurting anything, and he's a good distance from the ranch. Let him go."

By the time Chet had listened to all this the badger had disappeared. The animal was not used to being aroused and was more frightened than any one.

They passed on. The very bottom of the Hollow was at hand. The horses proceeded slowly, realizing the peril of the place.

Once Rush went down into a hole nearly throwing Chet over his head. But the youth held on, and Rush arose all right, with nothing but a slight scrape on his left foreleg.

They peered with watchful eyes up and down the silent pass. Not a sign of any life was there. The water flowed on with a muffled murmur and the wind sighed through the deep opening, and that was all. In another five minutes the pass was left behind.

For some reason both boys drew a long breath of relief when the high ground beyond was reached. The strain was gone, and now, by contrast, the road looked as bright to them as if the sun was about to rise.

"Come to think of it, we may as well take it easy," remarked Paul. "It isn't likely that Dottery will care to make a move before daylight."

"Yes; but if we get there sooner, we'll have a chance to rest up a bit, and we need that, and so do the horses."

"I didn't think of that. Well, forward we go."

An hour passed and then another. Soon after Chet gave a joyous cry.

"There are Dottery's outbuildings! We'll soon be there now!"

"Right you are, Chet. I wonder – " Paul stopped short. "Oh, look over there!" he cried.

He pointed to a barn not a great distance back from the road.

The door of the structure was open and within flashed the light of a lantern.

"Dottery must be up, or else – " began Chet.

"Horse thieves!"

Both boys uttered the word simultaneously. Could it be possible that the thieves were raiding their nearest neighbor?

"Wait. Let us dismount and investigate," whispered Paul. "Don't do anything rash," this as Chet started to run toward the barn.

Thus cautioned, the younger boy paused. The horses were tied up behind some brush, and, guns in hand, the pair crept across the road and over a wire fence into the field.

Hardly had they advanced a dozen steps when three men came out of the barn, leading four horses. They made for an opening in the fence not a rod from where the boys flung themselves flat on the grass.

From the description they had received, the lads made up their minds that the men were Saul Mangle, Darry Nodley, and Jeff Jones.