"I've got an idea about a gate here," Charlie confided suddenly. "There won't be any more mysteries like this. I'm going to fix a swinging gate in place of these bars, Miss Louise. I shall have it swing uphill, like this; and I'll have a weight arranged so that it will always close itself, if one is careless enough to ride on and leave it open. I have it all worked out in my alleged brain. I shall do it right away, too. Aunt Marthy is rather nervous about this gorge, now. Every evening she walks up here herself to make sure the bars are closed."

"You may as well make up your mind to it," said Billy Louise irrelevantly, in a tone of absolute certainty. "Those calves were driven out of the gorge. That means stolen. You needn't accuse anyone in particular; I don't suppose you could. But they were stolen."

Charlie frowned and glanced up speculatively at the bluff's rim.

"Oh, your mountain-sheep theory is no good," Billy Louise giggled. "I doubt if a lizard, even, would try to leave the Cove over the bluff." Which certainly was a sweeping statement, when you consider a lizard's habits. "A mountain sheep couldn't, anyway."

"They're hummers to climb—"

"But calves are not, Mr. Fox! Not like that. You know yourself they were stolen; why not admit it?"

"Would that do any good—bring them back?" he countered, looking up at her.

"N-o, but I do hate to see a person deliberately shut his eyes in front of a fact. We may as well admit to ourselves that there is a rustler in the country. Then we can look out for him."

Charlie's eyes had the troubled look. "I hate to think that. Aunt Martha insists that is what we are up against, but—"

"Well, she knows more about it than you do, believe me. If you'll let down the bars, Mr. Fox, I'll hit the trail. And if I find out anything, I'll let you know at once."