"Now don't give a sign to-day," Tom whispered to his friend.

"If Don Luis is going to be crafty, we shall have to fight him with craft--at the outset, anyway."

"I hate to eat the old scoundrel's food," muttered Harry.

"So do I, but it can't be helped for the present. We're not guilty of a breach of hospitality in planning to show the rascal up.

It is Don Luis who is guilty in that direction. He is planning to use his guests as puppets in a dishonest game. Keep up your nerve, Harry, and don't let your face, your manner, or anything give you away."

Nicolas knocked as soon as he heard the boys stirring. He moved with speed this morning, spreading the table and then rushing away for chocolate, _frijoles_ and _tortillas_.

As soon as the boys had finished their breakfast they hastened out to the porch, but they found their host ahead of them. More, Don Luis wore field clothing and high-topped, laced walking boots.

"Going afield, sir?" Tom inquired, genially.

"I have been afield, already," replied Montez, bowing and smiling.

"Down to the mine I have been and back. The air is beautiful here in the early morning, and I enjoyed the walk. You, too, will enjoy our walks when you become used to them."

Dr. Tisco came out, bowing most affably to the young Americans.

"You look as though you had been walking, too," suggested Tom, noting Tisco's high-topped shoes.

"I went with Don Luis," replied the secretary. "Oh, by the way, Senor Hazelton, I believe some of your property has come into my possession. This is yours, is it not?"

Tisco held out a fine linen handkerchief, with an embroidered initial "H" in one corner. Harry was fond of fine linen, and effected these handkerchiefs.

"Yes; it's mine, thank you," nodded Harry, accepting the proffered bit of linen and pocketing it.

"I found it in a field, just this side of _El Sombrero_," remarked Tisco, artlessly, turning away.

Though the secretary did not watch Hazelton's face, Don Luis did, and saw the slight start of surprise and the flush that came to the young engineer's face.

"You, too, have been walking then, Senor Hazelton?" inquired Don Luis, pleasantly, though with an insistence that was not to be denied.

Harry didn't know how to lie. He might have dodged the question, but he was quick enough to see that evasion would make the matter worse.

"Tom and I took a stroll last night," he admitted, indifferently.

"How far did we go, Tom?"

"Who can say?" replied Reade, lightly. "It was so dark, and the way so unfamiliar that we were glad when we got home, I know."

"They have been prowling," muttered Don Luis, sharply, under his breath. "I must have them watched."

"Are we going to the mine this morning, Don Luis?" Tom asked, carelessly.

"Do you care to go, Senor Tomaso?"

"Why, that's just as you say, sir," Reade rejoined. "Of course, we would like to get actively engaged at our work. In fact, it seems to me that Harry and I should rise earlier and be at the mine at least from eight in the morning until six at night."

"You would soon tire yourselves out. The mine is a dirty hole."

"By the way, sir," Reade went on, carelessly, "how far do you have to send ore to have it smelted."

"About sixty miles."

"By mule-train, I suppose."

"Yes, Senor Tomaso."

"It must be costly shipping."

"So it is," sighed Don Luis, "and yet the ore is rich enough to bear easily the cost of shipping."

"In what direction is the smelter?"

Don Luis pointed.

"Straight ahead, as I am showing you," he added.

"We saw the lights of a train last night," Tom went on. "I judged that the mule-train came from the mines above. Yet the mule-train did not follow the direction that you have just shown me. The road runs crooked, I take it."

"Oh, yes," nodded their host, as carelessly as Tom had spoken.

"Do the other mines pay as well as _El Sombrero_?"

"Oh, no, Senor Tomaso," Montez replied quickly. "The other mines yield not anywhere near as rich ore as comes from _El Sombrero_."

"Are you going to take us to see the other mines?" Tom hinted.

"Gladly would I do so, Senor Tomaso, only I am not on good terms with the owners."

"I'm sorry," Tom sighed. "While we are here I wish that we could see much of Mexican mines. Nevertheless, when we are through here I have no doubt that you can give us letters to other mine owners."

"Beyond a doubt," smiled Don Luis, "and it will give me great pleasure. But I, myself own many mines, and I am seeking to locate more. If you are suited with my employment, and if we agree, I shall be able, undoubtedly, to keep you both engaged for many years to come. Indeed, if you display sufficient resourcefulness in handling mines I do not believe it will be long ere I shall be able to pay you each fifty thousand dollars a year. I have plenty of money, and I pay generously when I am pleased and well served."

"The scoundrel is fishing for something," thought Tom Reade, swiftly.

"I must not let him beat me in craft."

So he exclaimed, aloud:

"Fifty thousand dollars a year, Don Luis? You are jesting!"

"I beg to a.s.sure you that I am not," replied Montez, smiling and bowing.

"But fifty thousand a year is princely pay!" cried Reade.

"Such pay goes, of course, only to the most satisfactory of employes,"

declared Don Luis.

"At such pay," Tom said, "Harry and I ought to be satisfied to remain in Mexico all our lives."