Not a soul was in sight!

A quick look about verified this. The country beyond the knoll was perfectly flat, and for over five hundred yards was bare of even the smallest bush. Whoever the mysterious shooter was, he had, apparently, vanished into thin air.

"Hey, you guys, come over here!" yelled the Kid. "We been blazed at by a ghost!"

One by one the men by the water hole got to their feet.

Dick was the first to reach the Kid's side.

"He's right, boys!" called back Dick, as he saw the empty space behind the little hill. "Nobody here. But let's have a look at the ground. We can tell if it's been disturbed, anyway."

A careful search revealed not only the traces of someone having lain down on the loose earth, but also two empty shells.

"That makes me feel a little better!" cried the Kid as he saw this. "I don't hanker to be shot at by someone I can't see. Now the thing to do is to find out what happened to our late playmate."

"He's gone, ain't he?" asked Billee Dobb incredulously, as he came shuffling along. Off his horse Billee was a bit awkward.

"You don't say! Well, now, I never noticed that! Say, Billee, you a de-tect-a-tive by any chance?"