visitor. All was quiet at their camp, save for the distant howl
of a coyote, and the splash of the water into the reservoir. All
the stock had been driven away from Happy Valley to the big
round-up at Diamond X, but soon the fertile glade would again be
dotted with hungry cattle.

"Well, I reckon we'll have to give up," said Bud, when a thorough
search had been made, and no one discovered.

"The tunnel door doesn't show any signs of an attempt having been
made to bust it; does it?" asked Dick.

"Not as far as I can see, in this light," Bud replied. "We'll
take a stroll up here in the morning," he went on as he thrust
the stethoscope into his pocket. "Now for a little grub, and then
to hit the hay. Oh, boy! But I to tired!"

So were the others, and after rummaging among their camp stores,
and eating some crackers and canned peaches, the boys, having
picketed their horses, turned in, rolled up in their blankets,
and were asleep almost as soon as their heads were on the
pillows, which were, as a matter of fact, stuffed with hay.

An examination, next morning, disclosed nothing more in the
neighborhood of the tunnel entrance than their own and, their
ponies' feet marks, until Bud, with an exclamation, pointed to
several cigarette stubs on the ground, and a number of half-
burned matches.

"Some one was here last night--or yesterday!" he declared. "And