"Not yet, but that's only a question of a few minutes now. At present they are unhitching and cooking a meal. Luckily the shade at this time of day lies to the north-west of the mesa, so that they may not explore the other side for some time."

"Let us hope not. But what have you found out about them? What are they doing here?"

"Just what I suspicioned. They are a part of a gang of gun-runners."

"Gun-runners?"

"Yes. From listening to their conversation, I have found out that this insurrection's a heap worse than we ever supposed. Half of Chihuahua is up in arms ag'in the government, and they are plotting to blow up railroad bridges, cut wires, and paralyze the country generally. Then they are goin' ter raid all the American mines and get the gold."

"Why, dad's mine's in Chihuahua, close to the border," gasped Jack.

"I know it. I heard that greaser ragamuffin, Black Ramon, mention his name. Your dad's the first one they're goin' after——"

"The scoundrels."

"They owe him a grudge, you know, and now's their chance to get even."

"Do they know that dad is in Mexico now?"