The Tale of the Ghost Riders is a novella written by John Vornholt. It was seventh book in the Are You Afraid of the Dark? book series and was first published in 1996.
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Stampede!
Josh feels all alone since his wild and crazy brother Will died. Now he's galloping toward trouble with his new friend Carlos as they trail an old Native American skinwalker to a cave amidst ancient ruins, hoping to discover his magic. When a mountain lion corners Josh and scares Carlos away, the skinwalker reappears with a warning: unless Josh changes his ways he'll come to a bad end like Will. If he's looking for trouble, the desert will give him trouble.
The desert is watching. Will is watching--from Beyond.
But the boys can't resist the chance to get even with an enemy rancher. That's when the pale riders arrive, thundering down from the sky...