As he searches for his uncle through the rugged Southwest canyon country, fourteen-year-old Clay becomes involved with a group of Navajo Indians who are trying to save some of the last wild mustangs. Fourteen-year-old Clay Lancaster has been dreaming for years of the adventure he calls The Big Wander -- a summer in the Southwest with his older brother, Mike, searching for their uncle Clay. When Mike decides to return home to Seattle and the girlfriend he left behind, Clay chooses to stay on and continue the search on his own. Following a tip about his uncle, he heads out into the most remote canyons of the Navajo reservation, with only a burro and a dog named Curly for company. Clay loses his heart to the vast, rugged land -- and to an adventurous girl with a long, dark braid -- but finds his uncle in big trouble. Can Clay pull off a risky plan to save his uncle -- and the wild horses Uncle Clay has put his own life in jeopardy to protect?