The money, books, and papers, with which the business of the day had been conducted, had been carried into the vault by the cashier, and Mr.

Creviss, who was an unusually cautious man, looked into the vault after the cashier came out, to see that everything was in. Then he closed the vault doors, and turned the handle of the combination, setting the time lock, thus securing the doors from being opened until nine o'clock the next morning.

The only way in which it could be opened, and an almost impossible way, at that, was by blowing it open.

And yet the vault had been robbed, and the vault lock had apparently not been tampered with.

It had the appearance of necromancy.

Ted rode into town with Billy Sudden, arriving about noon.

Billy rode on to the Dumb-bell Ranch, and Ted stopped at the bank. It seemed deserted. But as he entered the door he saw a big man, dressed in the flashy clothes affected by managers of cheap circuses and fake shows, standing at the end of the counter talking to Wiley Creviss.

"I can't do anything with that check," Ted heard Creviss say. "You'll have to come in when the cashier is here. The safe is locked, and I can't get into it, anyway, and all the currency is in it. I'm only staying here until the cashier gets back from dinner."

"When will that be?" asked the stranger.

"In about half an hour."

The stranger picked up his valise, which seemed to be heavy, and walked out grumbling about banks that closed up for dinner.

Ted said nothing to Wiley, but he took a good look about the bank, disregarding the other lad's scowls.

He observed that the vault door stood open, but that there was no money in sight, and the place had an air of desertion, as if business was slack.

When Strong had seen all that he wanted of the apparent entrances to the bank that a criminal might use to force his way in, he left with two distinct impressions on his mind. One was that the vault door had been open when he came in, and that Wiley Creviss had abruptly closed it when he saw Ted staring at it. The other was the remarkable appearance of the showman, for without doubt he was that.

As before, the mysterious robbery of the bank proved to be too hard a nut for the citizens to crack, and when they had thrashed out all the theories advanced and knocked them to pieces again, they forgot it.

Not so Ted Strong. This succession of robberies, none of them leaving behind the slightest clew to the perpetrators, interested him. Its very difficulty of solution, which had made the lesser brains abandon it, compelled his attention and interest.

Had it been his business to tackle the problem, he gladly would have done so. But the only Federal end to it was the robbery of the post office, which the inspectors of that department were working on, unless, perhaps, it might be found that the funds of the government for general purposes at Fort Rincon had been stolen. Then the case would come under the operations of the United States marshal's office.

But other and more pressing things of a personal nature gradually took his attention from crime, and he devoted himself to the coming round-up.

All the spare room in the Moon Valley Ranch house was occupied by visiting cattle buyers, who had come to the round-up. The rooms of the boys had been given up to guests, while they camped on the prairie behind the house.

At last the great day came.

Early in the morning the boys were out, and with them was Stella.

Cow Suggs had loaned Ted his outfit for the day, and Ted was glad to have the boys, for there was no cleverer cowman in the country at a round-up, saving Ted himself, who was king of them all, and so conceded, than the dark, lithe cow-puncher, Billy Sudden, who had been through college and had traveled in Europe before he deserted the East for the toil, freedom, and excitement of the range.

It was now time to round up all the stock on the Moon Valley Range, cut out the marketable stuff, and brand the yearlings.

This is not only a troublesome task, but it is dangerous, and not a moment of the time until the task is accomplished but has its exciting adventures and escapes from death.

The boys did not know exactly how many head of cattle they owned. They had been selling and replenishing their stock from time to time, and the increase of calves had been very large, for Moon Valley, situated in the lee of Dent du Chien, or Dog Tooth Mountain, with its rich gra.s.s, the richest in the Black Hills, and its abundance of fresh, clear spring water, was an ideal breeding place.

There were on the ranch at that time several dangerous bulls, and this added to the hard work of the day, because the monarchs of the range did not like to be disturbed and have their following broken up and scattered.

In the big pasture, which lay at the foot of Deni du Chien Mountain, was the largest herd in the valley.

The king of this herd was known as "Gladiator." He was always looking for a fight, and never refused a challenge, whether from another bull or from what he considered his natural enemy, man.

A man on foot in that pasture would have stood no more chance for his life than if he tried to stand in front of the engine that hauls the Empire State Express going at top speed. Gladiator would kill him just as quickly and as surely.

So it was that strangers were kept out of the big pasture, whether they were mounted or not, unless they were escorted by some member of the broncho boys, or one of the older cowboys about the place. Stella, with her red bolero, nearly caused a tragedy one day by coming within the vision of Gladiator, who took the bolero for a challenge.

Stella turned in time and fled, and had it not been for the fleetness of her pony and her own superb riding, there had been no more to relate of the adventures of the girl pard of the Moon Valley boys.

The morning of the round-up Ted undertook personally to turn the herd to the rendezvous.

Stella insisted upon accompanying him, and at last he was persuaded to give his consent, but only on the condition that she wear subdued colors, which she did, with skirt and jacket of a light-dun color.

The herd was grazing in the n.o.ble range that stretched for miles along and across the valley in the shadow of the splendid mountain.

It was widely scattered, and as the band of hors.e.m.e.n rode out toward it the cattle lifted their heads for a moment and took a quiet survey, then returned to their feeding.

Not so Gladiator.

The great white-and-black bull raised his head proudly, and his fierce, steady eyes regarded them without fear.

Indeed, Gladiator knew no fear, whether of man or beast, wolf pack or mountain lion, serpent or bird of prey.

He was monarch of that herd, and no one said him nay except Ted Strong, who ruled the ranch and all that was on it, by the general consent of his comrades and his own fitness for his rulership.

Ted and Gladiator had had numerous differences, and it was the bull that had backed down every time.

Yet he did not fear Ted. Rather he hated him because he could not conquer this quick, brave, and resourceful fellow.

"That bull will be the death of you some of these days," said Stella to Ted once when Gladiator, resenting Ted's intrusion into the herd for the purpose of cutting out some calves, charged him. But Ted in the end threw the bull with his rope, humiliating him before all the herd. From that time forth Gladiator's eyes always became red with anger when he saw Ted, but he did not misbehave, because he respected Ted's lariat and quirt, and the strong arm that wielded them.

When they got to the herd the boys circled it from behind, riding in slowly.

Ted and Stella were on the left point, with Bud and Kit opposite.

Bill Sudden was in the rear to drive, while the other Moon Valley cowboys and Billy Sudden's boys came in from the sides.

At the first interruption of their grazing the cattle moved along sluggishly, but Gladiator did not move.

The big bull stood his ground, with eyes gazing steadily at Ted and Stella, who were approaching him slowly and persistently.

Suddenly Gladiator threw up his head and gave a low, menacing bellow.

"The old chap is waking up," said Ted.

"Be careful, Ted," said Stella. "He's not in very good humor."