For seventeen-year-old Matt Lewis, the nearby Tobacco Root Mountains of western Montana are his playground. They provide a refuge from the pressures of high school, a physical challenge as he hikes the highest peaks and valleys, and welcome solitude among the bounty of nature. When Matt stumbles onto a dangerous secret and his life is threatened, he takes to the hills, confident that he can lose his pursuers in the familiar wilderness—until a tracker comes after him with a hound he can't shake.