When fourteen-year-old wannabe cowboy Noah Odell and his widowed mother leave rainy Gold Hill, Oregon, to join Noah's flamboyant uncle Bud on a ranch in New Mexico, they find themselves in the middle of nowhere with daily temperatures in excess of 100 degrees; enough rattlesnakes, buzzards, and hungry coyotes to start a zoo; a dozen scrawny steers; and a smelly outdoor toilet overrun with black widow spiders.

When Bud presents Noah with a cantankerous mule named Brimstone, the adventures begin. Accompanied by his new best friends--an unlikely cowboy philosopher named Marvin Couch and a...