ading
for the cave that lies in an unknown part of the Grand Canyon, and all
the while dodging about for fear that he is followed."

"Yes," added Frank, falling in with the idea; "and perhaps there are the
Moquis from his village who may have had word somehow of his return,
searching for Havasupai, and bent on bringing him to the bar of their
tribal law. To finish the game, think of our friends, the two sheriffs,
loose in the big gash, and hunting for the men who have snapped their
fingers in their faces so often across the line!"

"Well, it sure looks like there might be some warm times coming,"
remarked Bob. "I suppose we take our guns along with us when we're going
the rounds of the sights?"

"Wouldn't think of doing anything else," was Frank's reply. "No telling
when we might need 'em. Suppose, now, those two rascals the sheriffs are
after should learn in some way about the value of the paper Uncle Felix
has with him, wouldn't they just make it the game of their lives to try
and capture him? And I reckon Eugene, too, will be so dead in earnest
that he won't stop at little things, backed up by such a reckless
character as the Mexican. Yes, the repeating rifles go along, Bob!"

"This water feels fine after that long, dusty and tiresome ride, eh?"
remarked the young Kentuckian, as he splashed in the deep basin, and
then proceeded to use the towel vigorously.

"It certainly does," Frank admitted, as he did likewise.

Shortly afterward the two boys went down to supper. The hotel had its
usual number of guests, this being a favorite point for parties to start
on the tour.

"Don't look just now," said Frank, as they sat at a table; "but Abajo
has taken his seat right back of you. And it wasn't accident, either,
that made him do it; I believe he has been set to watch us!"

From time to time, as they ate, Frank would report as to what the
half-breed was doing; and while nothing occurred to actually prove the
fact, still he saw no reason to change his mind.

"And I'm going to find out if he's keeping an eye on us, so as to report
to his employer, Eugene Warringford," Frank announced, as they were
drawing near the end of the meal.

"That sounds good to me," Bob remarked; "but how will you do it?"

For answer Frank drew out a paper from an inner pocket.

"You see this document," he observed, with a solemn look. "Well, it's
only what you might call a dummy, being just an invitation I received a
little while back to