"What thing?" demanded Stubbs.

"By George!" e.j.a.c.u.l.a.t.ed Hal in exasperation. "You're the limit, Stubbs."

"Sure I am," was the little man's smiling response. "Otherwise, I wouldn't be in this tent with you."

"Stubbs," said Chester, a sudden idea striking him, "have we done something you don't like?"

"You have," was Stubbs' reply.

"By Jove!" said Hal. "We're sorry for that, Stubbs. We apologize. Will you tell us what we've done?"

Stubbs looked at the lad with a peculiar smile on his face. He was silent several moments before replying:

"You don't know, eh?"

"Of course not."

Stubbs shrugged his shoulders and started out of the tent.

"Say!" Chester called after him, "are you going to tell us or not?"

"Not!" said Stubbs briefly, and was gone.

"Now what do you think of that?" demanded Chester of his chum.

"There's something wrong with him," was Hal's reply. "I haven't any idea what it can be."

"Suppose it is because we were poking fun at him the other night?"

"I don't know. I don't believe he would take a thing like that to heart.

However, you can't tell."

"Anyhow," said Chester, "we're not likely to find out what it's all about until he gets good and ready to tell us."

"You're right, there," returned Hal. "He can be as mum as an oyster when he wants to. Well, old boy, I'll leave you alone now and go out and look around a bit. Maybe I can stumble on this conspiracy Stubbs talks about."

"You mean the one he won't talk about," said Chester with a smile. "All right. Go ahead. I'll take a little snooze."

He rolled over on his side as Hal left the tent.

How long Chester slept he did not know, but it was dark in the tent when he opened his eyes.

"Wonder what can be keeping Hal?" he muttered to himself.

He had hardly had spoken the words when a form came through the entrance to the tent. Chester was about to speak, for he thought at first that it was Hal, but something seemed to tell him to remain silent. The lad, therefore, said nothing.

At second glance Chester realized that the figure that had entered the tent was not Hal. Neither was it Stubbs.

"Great Scott!" muttered the lad to himself. "Wonder who he is and what he wants here? He hasn't seen me though. Guess I'll wait and see what happens."

The lad stretched out a hand carefully and drew toward him a camp stool upon which he had laid his clothes before going to bed. Without a sound he secured one of his revolvers and straightened to a sitting posture.

"I'm ready for whatever happens," he told himself.

The intruder had now taken up such a position in the tent as to command a view of the entrance, shielded from sight himself. Chester saw something glisten in the man's hand.

"Gun," said the boy to himself. "Guess I can beat him to it."

Came footsteps without. They stopped just outside the tent. Chester saw the nocturnal visitor in the tent raise his revolver arm. Chester did likewise.

"I'll just shoot that gun out of your hand, my friend," he said quietly.

He took deliberate aim.

CHAPTER VIII

AN UNKNOWN ENEMY

The footsteps outside came nearer the entrance. Chester's finger tightened on the trigger of his revolver, as he saw the stranger in the tent draw himself taut.

At that moment Hal's figure appeared in the entrance.

There were two sharp cracks, so close that they seemed as one, and two spurts of flame in the darkness. Came a cry of pain from the stranger in the tent and Hal dashed forward.

"Quick, Hal! Grab him!" shouted Chester.

But quick as he was, Hal was not quick enough. With a snarl the man jumped toward Hal even as Hal leaped himself. The stranger was of much greater bulk than Hal and the lad was hurled to the ground. When he regained his feet the stranger had disappeared.

Chester, unmindful of his wound, had leaped from his cot and now ran outside. Some distance away he saw a figure disappear in the darkness.

The lad did not fire a second shot, for at that distance he could not be sure of a hit and he did not wish further to alarm the camp.

Hal struck a light and the two chums looked at each other.

"Did you get a look at him, Hal?" asked Chester.

"No, did you?"

"No. He was in the tent for some time, but I waited until I was sure what he was going to do before I fired, though I had him covered all the time."

"You must be losing your eye. At that distance you should you should have potted him without trouble."

"I guess I could have done it this time had I tried," returned Chester.

"I shot at his revolver."