Chapter I: At the Horse Corral Gate

"There he is again, Frank! The same queer chap we saw before!"

"That's a dead certainty, Lanky. But lower your voice a bit or he might take the alarm and vamoose."

"I sure wonder what he's prowling around Rockspur ranch-house for, and on a moonlight night, at that. But, Frank, it isn't our old enemy, Nash Yesson, is it?" cried Lanky Wallace explosively.

"No. And I'm just as sure it isn't Lef Seller," came from Frank Allen, referring to the bully of Columbia, Frank's home town.

The scene was the living room of Rockspur Ranch in the far West, where so many exciting things had already happened to Frank Allen and his chums, Lanky Wallace--whose folks owned the ranch--and Paul Bird. Paul was slumbering peacefully, totally unaware of what was taking place outside.

"There! You can see him plainer now, Frank!" went on Lanky. "He seems to be a runt of a man, with a big head and bushy hair. An ugly customer, I'd say. Do you reckon he's mixed up with the Yesson crowd?"

"Looks that way to me. See him wriggling along now, like a snake in the grass. He's up to some mischief, all right."

"He's wearing a cowboy hat, you can see now, Frank; must belong over with that tough gang at the Double Z Ranch."

"Whatever his game is, he'd better watch his eye or he'll find Lige Smith and his punchers hustling after him. Right now they're all radio hounds, and bunched inside the bunk-house, listening to jazz dance music."

"Say, I wonder, Frank!"

"What's struck you now, Lanky? Don't move, for that fellow's staring straight at this window! Gee, I'm glad our fire's died down! There! he's moving off again. What were you wondering about?"

Lanky Wallace snickered, as though amused by his thoughts.

"Why, don't you see, Frank? he's trying to find some way of getting hold of the map we grabbed, along with the gold nuggets when we watched Nash Yesson and Lef Seller dig up that rusty iron chest in the underground cellar."

Frank Allen considered the suggestion seriously, waiting a full minute before replying.

"Sounds reasonable, I must admit," he finally agreed. "We know that it was the crude map Josh Kinney left hidden there, that pair was so anxious to lay their hands on."

"Sure! It contains valuable clues that would help a prospector locate the long-lost gold claim Josh worked years ago."

"Now he's moving off, for some reason or other," went on Frank Allen. "It might pay us to slip outside and see if we can't get a line on his scheme."

"Bully! I was just wishing you'd say something that meant action," whispered Lanky Wallace. "But I hope you're not thinking of rousing a hornet's nest around his ears by poking a stick in the bunk-house and stirring up the Rockspur punchers?"

"Nope. We'll play this game by ourselves, Lanky. Sorry Paul happens to be asleep and nursing his lame ankle. He's going to miss all the excitement."

"Lucky for us we chanced to take a squint out of this window in the big living room before hitting the hay in our cubbyhole bedrooms." This being followed by a series of boyish chuckles, told plainer than any words could have done how pleased Lanky felt over the situation.

"Come along, and we'll slip out by the back door." Saying this, Frank led the way, with his chum trailing at his heels.

Mrs. Wallace and Minnie Cuthbert--a Columbia girl who had come West for the summer vacation, partly to be companion for Lanky's mother, and who was also a tried and true pal of Frank Allen's--had retired some time before, leaving the two boys to sit up and talk over their plans for the near future.

Softly Frank and Lanky passed into the kitchen, which they found empty at that late hour of the night, Charlie Gin Sing, the slant-eyed Chinese cook, having joined the bunch over at the bunk-house to listen as the loud-speaker sent out weird jazz, which seem to appeal to his sense of music.

"Wait while I take a peep first and make sure he didn't swing around to this side of the ranch buildings," Frank cautioned in his companion's ear.

"Coast Clear?" queried Lanky, with bated breath, a moment later.

"Yes. And I could just make him out moving toward the horse corral!" Frank informed him.

"Say, you don't reckon he's got some funny game up his sleeve, do you, Frank?"

"What kind?"

"Oh, such as would set the saddle band of broncos streaking it out on the prairie, mad with fear, to leave the Rockspur punchers without a single mount to saddle."

"What good would that do him, Lanky? Though perhaps he might hope to find a chance to steal that map while the men were all rushing after the stampeding ponies. But we'll try to look out for that sort of game. Come on!"

The chums crept outside. One thing Frank Allen had already noticed that seemed to be in their favor--the rear part of the house was in shadow. Even the keenest of eyes could not discover that the kitchen door had opened to give egress to a couple of bent-over figures.

"See him still?" asked Lanky eagerly.

"He ducked into that bunch of cottonwoods over there," Frank informed him. "Just the same, you must remember that the corral lies at the far end of that patch of woods. Now for some scout work! And it'll pay us to keep as close to the ground as we can."

"Whee! hope we don't run across any rattlers out here, Frank?"

"No danger," whiffed the other over his shoulder, for he was advancing steadily and cautiously; "those who ought to know say that snakes never move around during the night."

A soft sound like escaping steam told how greatly relieved Lanky felt; for from early childhood his one horror had been serpents of any kind. He had even been known to make a wry face when impaling an angleworm on his hook, as if it reminded him of his pet aversion.

Frank stuck to his original belief that the mysterious prowler was heading for the horse corral, and he shaped his course so as to come upon this fenced-in enclosure somewhere near the gate.

The stockade was of such a height that even a prize jumper among the broncos could never get its forelegs across the upper bar. Besides this, in order to further insure the safekeeping of the restless ponies, a hedge of thorny Osage orange had been cultivated, the mature trees giving the animals considerable shelter from the scorching rays of an August sun.

Every dozen feet or so Frank would come to a pause, and at such times seemed to be using both eyes and ears to discover any unusual movement or sound around the corral.

"You were right, Frank," whispered Lanky, catching hold of his companion's arm with his fingers and pinching harder than he intended. "I just glimpsed the fellow going inside. He's left the gate wide open too! Listen to the ponies snort and plunge, will you?"

"Get a move on, Lanky! We ought to be nearer the gate, so as to turn the horses back if they try to break loose."

Lanky was only too willing, since such a move promised to bring them to close grips with the possible horse-thief should the fellow start to rush from the corral after securing a mount.

The confusion inside the pen grew rapidly worse.

"He's trying to rope a pony he's picked out as a prize!" breathed the excited Lanky.

"We'd have him in a nice trap if we closed the gate of the corral and whooped for the boys to come on the jump!" suggested Frank, spurred on by the apparent necessity of doing something speedily.

"Good idea, too!" the other burst out, no longer caring who heard his voice, for the matter had by then about reached the crisis.

"Quick! He's coming full tilt, Lanky! Swing the heavy gate around this way and let me fasten it!"

It might have turned out better, if only they had conceived it a few seconds sooner. As it was, the rushing pony, urged on by savage kicks from a pair of spurred heels, was bearing down straight upon the two boys.

"Look out, Frank!" shrilled Lanky, as he saw a towering form between his eyes and the bright moon. At the same time he ducked in hopes of getting out of the way of the bronco's furious rush.

The frightened animal, seeing some moving object in its path, sheered to one side. That saved Lanky from the full force of a collision; but even as it was he received a push that sent him sprawling headlong to the ground.

Scrambling hastily to his feet, somewhat the worse for his upset, Lanky looked around to see what luck had befallen his partner in the mad attempt of trying to halt a frightened, galloping bronco.

"Oh, Frank!" he called out; and then his heart seemed to stand still with dread as he glimpsed a still figure huddled in a heap on the prairie some ten feet away, showing that Frank Allen had also been struck down.